A three-phase epidemiological study of short and long sleepers in a middle-aged Chinese population: prevalence and characteristics.
Braz J Med Biol Res 2014;
47:157-65. [PMID:
24519132 PMCID:
PMC4051176 DOI:
10.1590/1414-431x20133430]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 10/29/2013] [Indexed: 11/24/2022] Open
Abstract
Epidemiological studies of short and long sleepers have not been conducted
previously. We collected socioeconomic, psychological, and polysomnographic
characteristics of 6501 parents (3252 men and 3249 women) of 4036 primary school
children in Guangzhou city. The study data were collected in three phases. The
overall prevalence of short (5 h or less) and long (10 h or more) sleep duration
was 0.52 and 0.64%, respectively. Long sleepers had higher Eysenck Personality
Questionnaire neuroticism scores [odds ratio (OR)=1.224, 95% confidence interval
(CI)=1.047-1.409] and lower education levels (OR=0.740, 95%CI=0.631-0.849) than
short sleepers. In the polysomnographic assessment, short, long, and normal
sleepers (7-8 h) shared similar durations of Stage 3 sleep (short=25.7±10.7,
long=20.3±7.9, and normal=28.0±12.8 min, F=1.402, P=0.181). In daytime multiple
sleep latency tests, short sleepers (10/19, 52.6%) were more prone to have a
short sleep latency (≤8 min) than long sleepers (2/23, 8.7%). In addition to
different sleep durations, neuroticism might also contribute to differences
between short and long sleepers in social achievements. Stage 3 sleep might be
essential for humans. The short sleep latency (≤8 min) of short sleepers in
multiple sleep latency tests should be interpreted cautiously, since it was of
the same severity as required for a diagnosis of narcolepsy or idiopathic
hypersomnia.
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