Periodic leg movements during sleep in children scheduled for adenotonsillectomy: frequency, persistence, and impact

The association of obstructive sleep apnea and behavioral insomnia in children ages 10 and under

STUDY OBJECTIVES

Behavioral insomnia of childhood (BIC) and obstructive sleep apnea (OSA) are highly prevalent conditions affecting 10%-20% and 1%-5% of children, respectively. Studies in adults and adolescents have suggested that comorbid insomnia and OSA may have distinct clinical characteristics. The association between the two conditions in the pediatric population has not been thoroughly investigated. This study aimed to examine the association between BIC and OSA in young children.

METHODS

Children, 6 months to 10 years old, referred to a sleep specialist and polysomnography at the Hadassah Medical Center between 2018 and 2021 were included in this retrospective analysis. We excluded children with chromosomal and craniofacial abnormalities, posttonsillectomy, or neurological impairment. BIC diagnosis was extracted from the electronic health records in accordance with the International Classification of Sleep Disorders, third edition criteria. OSA was diagnosed by polysomnography (apnea-hypopnea index > 2 events/h).

RESULTS

Of 312 children (age 4.42 ± 2.42 years), 126 (40.4%) were non-OSA non-BIC, 125 (40.1%) OSA non-BIC, 34 (10.9%) BIC non-OSA, and 27 (8.7%) comorbid insomnia and OSA. OSA and non-OSA children had a similar prevalence of BIC. Children in the comorbid insomnia and OSA group were significantly younger (2.22 ± 1.21 years). Younger age at polysomnography, premature birth, and increased periodic leg movements on polysomnography were independently associated with OSA in a multivariable analysis. Lower body mass index, regardless of OSA, was associated with BIC.

CONCLUSIONS

Current findings do not support an association between behavioral insomnia of childhood and obstructive sleep apnea in children. Healthcare providers should consider each of these sleep disorders in children presenting with sleep difficulties since each has distinct diagnostic and therapeutic options.

CITATION

Yelov L, Reiter J, Meira E Cruz M, Gileles-Hillel A. The association of obstructive sleep apnea and behavioral insomnia in children ages 10 and under. J Clin Sleep Med. 2024;20(2):245-251.

Obstructive sleep apnea and periodic limb movement in children: is there really an association?

PURPOSE

Periodic limb movements (PLMs) can be found isolated or related to other sleep disorders, as Obstructive Sleep Apnea (OSA). Nevertheless, this association was described before the proposal for modification of the World Association of Sleep Medicine (WASM), which incorporated major changes modifying the definition of respiratory-related leg movements (RRLM) so that the relationship between OSA and PLM could be affected.

METHODS

A total of 131 PSG were studied (children with ages from 5 to 12 years old), all referred because of a suspicion of sleep-disordered breathing (65 children were diagnosed of OSA, and 66 presented snoring but no sleep apnea). Leg movements were manually scored according to both 2006 and 2016 WASM/IRLSSG criteria.

RESULTS

According to 2006 WASM rules, statistical differences were found, not only for PLM index (p 0.002), but all indexes. Nevertheless, according to new 2016 WASM rules, no statistical differences were found for PLM index (p 0.677), non-REM PLM index (p 0.299), REM PLM index (P 0.511) or PLM with arousal index (p 0.180), between OSA and non-OSA group. Positive correlation between PLM and RRLM have been found with both set of rules. The percentage of children with PLM>5/h is higher when using the prior PLM scoring criteria developed in 2006 (38.93%) versus the updated PLM scoring criteria (19.08%).

CONCLUSION

The lack of association when using the new WASM/IRLSSG scoring rules together with the absence of a previous clear etiopathology explanation may suggest that the association between OSA and PLM might be indeed overestimated and that, perhaps, it really did not exist.

Polysomnographic study in pediatric neurofibromatosis type 1

Background

Neurofibromatosis type 1 (NF1) is a genetic disease that alters neurodevelopment. We aimed to analyze the sleep macrostructure of a sample of children affected by NF1 without neurocognitive co-morbidities and MRI reports of unidentified bright objects (UBOs).

Methods

A 100 pre-pubertal children participated in the cross-sectional study: 50 subjects were children diagnosed with NF1 and 50 subjects were typically developing healthy children (TDC). All participants underwent polysomnographic evaluation through which conventional sleep parameters were collected: Total sleep time (TST), Sleep latency (SOL), first REM latency (FRL), number of stage shifts/h (SS/h), number of awakenings/h (AWN/h), wake after sleep onset (WASO%), sleep efficiency percentage (SE%), percentage of sleep time spent in sleep stages 1 (N1%) and 2 (N2%), slow-wave sleep (N3%), and REM sleep (REM%). Additionally, nocturnal respiratory events such as apnea/hypopnea index (AHI), oxygen desaturation index (ODI), and periodic limb movement index (PLMI) were recorded.

Results

Neurofibromatosis type 1 children showed a reduction in sleep duration parameters (TST; p < 0.001), sleep efficiency (SE%; p < 0.001), and stage N2% (p < 0.001). Moreover, the number of awakenings per hour (AWN/h), wake after sleep onset (WASO%), and respiratory events such as AHI, ODI, and PLMI resulted higher in NF1 vs. TDC children.

Conclusion

The data showed that the sleep macrostructure differs between NF1 and TDC children. These findings suggest that the evaluation of sleep may provide useful support in corroborating the diagnosis and offers additional therapeutic management perspectives in NF1 and genetic neurodevelopmental disorders in general.

The accuracy and difference of scoring rules and methods to score respiratory event-related leg movements in obstructive sleep apnea patients

OBJECTIVE

To compare manual scoring: 1) to the American Academy of Sleep Medicine (AASM) auto-scoring rules. 2) to the AASM and World Association of Sleep Medicine (WASM) rules, and evaluate the accuracy of the AASM and WASM for respiratory event-related limb movements (RRLM) in diagnostic and continuous positive airway pressure (CPAP) titration polysomnography (PSG).

METHODS

We retrospectively, re-scored diagnostic and CPAP titration PSGs of 16 patients with obstructive sleep apnea (OSA), using manual re-scoring by the AASM (mAASM) and WASM (mWASM) criteria for RRLM, periodic limb movements during sleep (PLMS), and limb movements (LM), which were compared to auto-scoring by the AASM (aAASM).

RESULTS

In diagnostic PSG, significant differences were found in LMs (p < 0.05), RRLM (p = 0.009) and the mean duration of PLMS sequences (p = 0.013). In CPAP titration PSG, there was a significant difference in RRLM (p = 0.008) and PLMS with arousal index (p = 0.036). aAASM underestimated LM and RRLM, especially in severe OSA. Changes in RRLM and PLMS with arousal index between diagnostic and titration PSG were significantly different between aAASM and mAASM, but there was no significant difference between scoring by mAASM and mWASM. The ratio of PLMS and RRLM changes between diagnostic and CPAP titration PSG was 0.257 in mAASM and 0.293 in mWASM.

CONCLUSIONS

In addition to the overestimation of RRLM by mAASM compared to aAASM, mAASM may also be more sensitive than aAASM in detecting RRLM changes in the titration PSG. Despite intuitive differences in the definition of RRLM between AASM and WASM rules, RRLM results between mAASM and mWASM were not significant and about 30% of RRLMs might be scored as PLMS by both scoring rules.

Associations Between Sleep-Disordered Breathing and Behavioral and Cognitive Functions in Children With and Without Attention-Deficit/Hyperactivity Disorder

BACKGROUND

Sleep-related problems are highly prevalent comorbidities in Attention-Deficit/Hyperactivity Disorder (ADHD).

OBJECTIVE

This study aimed to investigate the associations between sleep-disordered breathing (SDB) and behavioral and cognitive functions in children with and without ADHD.

METHODS

A total of 341 children were included (ADHD group: 155, control group: 186; age: 6-10 years). The participants' sleep-related symptoms were assessed using a parent-rated questionnaire, and they were categorized into low- and high-risk SDB groups based on their scores. Behavioral symptoms were assessed using the Behavioral Assessment System for Children, Second Edition (BASC-2), and cognitive sustained attention and inhibitory control were assessed using a computer-based continuous performance test.

RESULTS

In the ADHD group, the high-risk SDB children showed significantly higher scores than the low-risk SDB group in externalizing problems (F = 4.22; P = 0.042), including hyperactivity (F = 4.65; P = 0.033) and attention problems (F = 8.19; P = 0.005), but not internalizing problems. Meanwhile, in the control group, the high-risk SDB children showed significantly higher scores than the low-risk SDB group in internalizing problems (F = 9.89; P = 0.002), depression (F = 9.45; P = 0.002), and somatization (F = 7.83; P = 0.006), as well as in externalizing problems (F = 7.72; P = 0.006), including hyperactivity (F = 6.23; P = 0.013), aggression (F = 5.00; P = 0.027), and conduct problems (F = 6.79; P = 0.010). Contrary to the behavioral outcomes, none of the attention performance subscale scores showed significant differences between the high- and low-risk SDB groups in either the ADHD or control group.

CONCLUSIONS

The present findings suggest that SDB is associated with behavioral problems in children with ADHD and controls, with stronger associations in control children. On the contrary, SDB has no association with cognitive attention performance. This study extends our understanding of the associations of SDB with behavioral symptoms and cognitive functions in children.

Periodic limb movements during sleep are associated with poor health-related quality of life in patients with obstructive sleep apnea

PURPOSE

The clinical significance of the comorbidity of periodic limb movements during sleep (PLMS) in sleep-disordered breathing remains unclear. This study aimed to determine whether or not the presence of PLMS is related to depressed mood and poor quality of life in subjects with obstructive sleep apnea (OSA).

METHODS

We defined PLMS as a periodic leg movement index of > 15/h. Scores for the Medical Outcomes Study Short Form Health Survey and Beck Depression Inventory were assessed with multiple logistic or linear regression analyses.

RESULTS

Of 1370 subjects with OSA, a prevalence of PLMS was 14.1%. Older age, men, and obesity were positively associated with PLMS. PLMS occurred in 17%, 15%, and 12% of mild, moderate, and severe subjects with OSA, respectively. Severe OSA was less likely to be associated with PLMS than mild OSA. PLMS negatively correlated with physical and mental component summary scores of the health survey but not with Beck Depression Inventory scores after controlling for confounding variables. PLMS were significantly associated with poor sleep architecture on polysomnography. However, the relationship between PLMS and disturbed sleep was no longer significant after adjusting for age.

CONCLUSIONS

Health-related quality of life, including physical and mental health but not depressive symptoms, was worse in subjects with OSA and PLMS than in those without PLMS.

Different scoring rules for respiratory event-related leg movements: effects on the prevalence of periodic limb movements during sleep and their association with depressive symptoms in patients with obstructive sleep apnea

BACKGROUND

We compared the prevalence of periodic leg movements during sleep (PLMS) according to two different scoring rules of the American Academy of Sleep Medicine (AASM) 2012 and World Association of Sleep Medicine (WASM) 2016 and determined their association with depressed mood in patients with obstructive sleep apnea (OSA).

METHODS

PLMS, defined as a periodic leg movements index of >15, were diagnosed on a diagnostic and continuous positive airway pressure (CPAP) titration polysomnography using the AASM 2012 and WASM 2016 rules. The Beck Depression Inventory (BDI) and Epworth Sleepiness Scale (ESS) were used, and multiple regression analyses were performed.

RESULTS

Among 160 OSA patients, the proportion with PLMS scored by the WASM 2016 criteria was significantly higher than that scored by the AASM 2012 criteria in a diagnostic study (20.6% vs. 16.3%, respectively; P = 0.016) but not in CPAP titration study and only in patients with severe OSA. In adjusted models, PLMS were positively associated with BDI scores and a BDI of ≥10 on both diagnostic and CPAP titration studies when scored by the WASM 2016. By contrast, when scored by the AASM 2012, PLMS were associated with BDI scores (but not BDI of ≥10) only in a CPAP titration study.

CONCLUSIONS

There are significant differences in the prevalence of PLMS and their association with depressed mood depending on the scoring rules in patients with OSA. The current AASM scoring criteria underestimate the prevalence of PLMS, and PLMS are more likely associated with depressed mood according to the WASM scoring criteria.

Clinical characteristics of periodic limb movements during sleep categorized by continuous positive airway pressure titration polysomnography in patients with obstructive sleep apnea

PURPOSE

The presence of periodic limb movements during sleep (PLMS) varies among patients with obstructive sleep apnea (OSA) undergoing treatment with continuous positive airway pressure (CPAP). The factors associated with this variation are unknown.

METHODS

PLMS were defined as a periodic leg movements index of > 15/h. Patients with OSA and PLMS were categorized into four groups depending on diagnostic and CPAP titration polysomnography (PSG). A multinomial logistic regression analysis was performed using a non-PLMS group as the reference category.

RESULTS

This study included 861 patients with OSA who underwent a full-night CPAP titration PSG. The proportions of the subjects with PLMS on both PSGs (persistent PLMS), those with CPAP-emergent PLMS, and those with CPAP-resolved PLMS were 12.9%, 9.2%, and 3.9%, respectively. Compared with the non-PLMS group, the persistent group was more likely to be of older age and male sex and has a higher body mass index and restless legs syndrome (RLS). Patients in the CPAP-emergent group were also older and more likely to have RLS as well as more severe apnea. Patients in the CPAP-resolved group were more likely to be women, of older age, have a higher body mass index, but less severe apnea.

CONCLUSIONS

PLMS elicited by CPAP are more likely to occur in older patients with more severe sleep apnea and comorbid RLS, whereas OSA patients in which PLMS resolve after CPAP are more likely to be women and have milder sleep apnea. Persistent PLMS share clinical characteristics with PLMS in general population.

High prevalence of periodic limb movements of sleep in children with Down syndrome

STUDY OBJECTIVES

Increased periodic limb movements of sleep (PLMS), > 5 events/h, are present in 1.2% to 7.7% of healthy children and associated with hypertension, attention deficit, and hyperactivity. This study sought to determine the prevalence of elevated PLMS in a large cohort of children with Down syndrome (DS) and their correlation with OSA and ferritin levels.

METHODS

Retrospective chart review of all children with DS ages 2 to 18 years in whom single baseline polysomnography (PSG) was performed at a pediatric hospital over 5 years.

RESULTS

A total of 418 children met inclusion criteria. Three hundred fifty-six children (85%) were referred because of concerns about sleep-disordered breathing; 49 (12%) were referred for screening per American Academy of Pediatrics (AAP) guidelines; and 13 (3%) because of concerns about restless legs or periodic limb movement disorder. One hundred thirty-nine children (33.3%) had elevated PLMS; they were younger (6.3 years) than those without elevated PLMS (7.7 years). OSA was present in 176/418 (42.1%) children, including 13/49 (26.2%) asymptomatic children referred for screening PSG. Ferritin levels were only recorded in the charts of 65 of the children with elevated PLMS (46.7%); in 36 (55.4%) levels were < 50 ng/mL.

CONCLUSIONS

PLMS were increased in a substantial number of this large cohort of children with DS. Additional studies are necessary to assess utility of laboratory testing to predicting PLMS in similar, at-risk, populations. Screening PSG has value in identifying OSA in young, ostensibly asymptomatic children with DS. The prevalence of OSA increased with age in this cohort, unlike in typical children, requiring health care providers to remain vigilant for its emergence across the lifespan.

Prevalence and correlates of periodic limb movements in OSA and the effect of CPAP therapy

OBJECTIVE

We sought to assess the prevalence, correlates, and consequences of periodic limb movements of sleep (PLMS) in persons with obstructive sleep apnea (OSA) and the effect (worsening or improvement) of continuous positive airway pressure (CPAP) therapy on PLMS in a large prospective multicenter randomized controlled trial.

METHODS

We performed retrospective analyses of data from the Apnea Positive Pressure Long-term Efficacy Study, a prospective multicenter randomized controlled trial. A total of 1,105 persons with OSA enrolled in this study underwent a polysomnographic investigation at baseline, another one for CPAP titration, and another study 6 months after randomization to either active CPAP or sham CPAP.

RESULTS

Of all participants, 19.7% had PLM index (PLMI) ≥10/hour, 14.8% had PLMI ≥15/hour, 12.1% had PLMI ≥20/hour, 9.3% had PLMI ≥25/hour, and 7.5% had PLMI ≥30/hour. The odds of having a PLMI ≥10 were higher in older participants (odds ratio [OR] 1.03, p < 0.001), men (OR 1.63. p = 0.007), those using antidepressants (OR 1.48. p = 0.048), and those with higher caffeine use (OR 1.01, p = 0.04). After controlling for OSA and depression, PLMS were associated with increased sleep latency, reduced sleep efficiency, and reduced total sleep time. No significant relationships were noted between PLMS frequency and subjective sleepiness (Epworth Sleepiness Scale score) or objective sleepiness (Maintenance of Wakefulness Test). There was no differential effect of CPAP in comparison to sham CPAP on PLMS after 6 months of therapy.

CONCLUSIONS

PLMS are common in patients with OSA and are associated with a significant reduction in sleep quality over and above that conferred by OSA. Treatment with CPAP does not affect the severity of PLMS.

A usability study of an internet-delivered behavioural intervention tailored for children with residual insomnia symptoms after obstructive sleep apnea treatment

Better Nights, Better Days (BNBD) is a 5-session online intervention designed to treat insomnia in 1-10-year-old children (Corkum et al. 2016). Obstructive sleep apnea (OSA) and insomnia commonly occur in children and, after surgical treatment for OSA, it is estimated that up to 50% of children may continue to suffer from insomnia symptoms. Access to insomnia interventions following OSA treatment is limited as there are few programs available, few trained practitioners to deliver these programs, and limited recognition that these problems exist. The current study involved the usability testing of an internet-based parent-directed session of BNBD tailored towards the needs of children (ages 4-10 years) who experience residual insomnia symptoms after treatment of OSA. This new session was added to the BNBD program. Participants (n = 43) included 6 parents, 17 sleep experts, and 20 front-line healthcare providers who completed and provided feedback on the new session. Participants completed a feedback questionnaire, with both quantitative and qualitative questions, after reviewing the session. Quantitative responses analyzed via descriptive statistics suggested that the session was primarily viewed as helpful by most participants, and open-ended qualitative questions analyzed by content analyses generated a mix of positive and constructive feedback. The results provide insights on how to optimally tailor the BNBD program to meet the needs of the target population and suggest that testing the session on a larger scale would be beneficial.

Polysomnography in Pediatric Otolaryngology: If Not Obstructive Sleep Apnea, What Is It?

Objective

To determine common polysomnographic (PSG) diagnoses for children referred by otolaryngologists.

Study Design

Retrospective case series with chart review.

Setting

Single tertiary pediatric hospital (2010-2015).

Subjects and Methods

Review of the medical records of 1258 patients undergoing PSG by otolaryngology referral. Patients who underwent previous otolaryngologic surgery were excluded. Data distributions were evaluated using means with standard deviations for continuous variables and frequencies with percentages for categorical variables.

Results

A total of 1258 patients were included; 55.9% were male, 64.5% were Caucasian, 16.6% had Down syndrome, and 48% had public insurance. The median age at the time of PSG was 5.2 years (range = 0.2-18.94). Indications for PSG were sleep-disordered breathing (SDB; 69.4%), restless sleep (12.7%), airway anomalies (7.5%), and laryngomalacia (7.2%). SDB was seen in 73.4%, obstructive sleep apnea (OSA) in 53.2%, OSA + central sleep apnea (CSA) in 4.5%, CSA in 0.9%, and non-OSA snoring in 15%. Other diagnoses included periodic limb movements of sleep (PLMS; 7.4%), hypoventilation (6.8%), and nonapneic hypoxemia (2.6%). SDB was more common in younger children and seen in 91.4% of children <12 months and in 69.2% of children ≥24 months, while non-OSA snoring was more common with increasing age (3.7% in children <12 months, 17.7% of children ≥24 months). PLMS were seen in 8.9% of children ≥24 months and in no children <12 months.

Conclusion

While OSA and snoring were the most common diagnoses reported, PLMS, alveolar hypoventilation, and CSA occurred in 7.4%, 6.8%, and 5.4%, respectively. These findings indicate that additional diagnoses other than OSA should be considered for children seen in an otolaryngology clinic setting who undergo PSG for sleep disturbances.

Sleep and Breathing the First Night After Adenotonsillectomy in Obese Children With Obstructive Sleep Apnea

STUDY OBJECTIVES

There are few studies measuring postoperative respiratory complications in obese children with obstructive sleep apnea (OSA) undergoing adenotonsillectomy (AT). These complications are further compounded by perioperative medications. Our objective was to study obese children with OSA for their respiratory characteristics and sleep architecture on the night of AT.

METHODS

This was a prospective study at a tertiary pediatric hospital between January 2009-February 2012. Twenty obese children between 8-17 years of age with OSA and adenotonsillar hypertrophy were recruited. Patients underwent baseline polysomnography (PSG) and AT with or without additional debulking procedures, followed by a second PSG on the night of surgery. Demographic and clinical variables, surgical details, perioperative anesthetics and analgesics, and PSG respiratory and sleep architecture parameters were recorded. Statistical tests included Pearson correlation coefficient for correlation between continuous variables and chi-square and Wilcoxon rank-sum tests for differences between groups.

RESULTS

Baseline PSG showed OSA with mean obstructive apnea-hypopnea index (oAHI) 27.1 ± 22.9, SpO₂ nadir 80.1 ± 7.9%, and sleep fragmentation-arousal index 25.5 ± 22.0. Postoperatively, 85% of patients had abnormal sleep studies similar to baseline, with postoperative oAHI 27.0 ± 34.3 (P = .204), SpO₂ nadir, 82.0 ± 8.7% (P = .462), and arousal index, 24.3 ± 24.0 (P = .295). Sleep architecture was abnormal after surgery, showing a significant decrease in REM sleep (P = .003), and a corresponding increase in N2 (P = .017).

CONCLUSIONS

Obese children undergoing AT for OSA are at increased risk for residual OSA on the night of surgery. Special considerations should be taken for postoperative monitoring and treatment of these children.

COMMENTARY

A commentary on this article appears in this issue on page 775.

Neurocognitive outcomes after pediatric adenotonsillectomy for obstructive sleep apnea: A systematic review and meta-analysis

OBJECTIVE

To provide an up-to-date systematic review and critical appraisal of prospectively performed studies evaluating neurocognitive function in children treated with adenotonsillectomy.

DATA SOURCES

PubMed/MEDLINE, Scopus, Web of Science, and the Cochrane Library.

REVIEW METHODS

Searches were performed from inception through September 2, 2015.

RESULTS

Nineteen prospective studies (898 adenotonsillectomy patients) met criteria and reported neurocognitive outcomes. The average age of children was 6.6±2.3 years (range 2.5-14 years) and 51.1% were male. Pre- and post-operative data utilizing the Neuropsychological Developmental Assessment score demonstrated an increase from a means±standard deviations of 101.5±14.7 [95% CI 100.0, 103.0] to 108.8±13.4 [95% CI 107.4, 110.2], p-value <0.0001 (375 children, three studies). Pre- and post-operative data utilizing the Stanford-Binet Intelligence Scales (IQ) demonstrated an increase in IQ scores from a means±standard deviations of 97.1±13.8 [95% CI 91.6, 95.4] to 100.7±11.1 [95% CI 100.4, 103.4], p-value <0.0001 (254 children, three studies). The mean pre- and post-adenotonsillectomy apnea-hypopnea index (AHI) decreased from 8.0 to 1.8 (274 children, six studies).

CONCLUSIONS

This meta-analysis found an improvement in neurocognitive function and IQ after pediatric adenotonsillectomy, especially in pre-school aged children. However, this must be interpreted with caution as only three studies were performed in pre-school aged children. The decreased effectiveness in older children suggests possibly a threshold age when neurocognitive deficits become irreversible.

Excessive daytime sleepiness in patients with ADHD--diagnostic and management strategies

The links between attention-deficit hyperactivity disorder (ADHD) and sleep disorders remain unclear. Specific sleep disorders are a frequent comorbid condition associated with ADHD according to a categorical approach. However, sleep disorders can also induce ADHD-like symptoms according to a dimensional approach and are thought to be the consequence of excessive daytime sleepiness. It may thus be difficult for clinicians to differentiate the diagnosis of ADHD comorbid with a sleep disorder from sleep disorders with ADHD-like symptoms. This distinction could be important for the appropriate management of patients with dual complaints of trouble maintaining attention and daytime sleepiness. This paper summarizes the main sleep disorders associated with ADHD: sleep-related breathing disorders, sleep-related movement disorders, circadian rhythm sleep-wake disorders, and central disorders of hypersomnolence (aka hypersomnias). The history of presenting symptoms should be taken into account since ADHD is a neurodevelopmental disorder whereas ADHD symptoms comorbid with sleep disorder are not. Finally, we propose a model to clarify the links between ADHD, ADHD symptoms, and excessive daytime sleepiness induced by sleep disorders. Clinicians should therefore routinely assess, monitor, and manage the sleep problems of patients with ADHD who have both comorbidities and should search for the presence of ADHD symptoms in subjects with sleep disorders.