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Sleep Disorders and Sleep Deprivation: An Unmet Public

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<strong>Sleep</strong> <strong>Disorders</strong> <strong>and</strong> <strong>Sleep</strong> <strong>Deprivation</strong>: <strong>An</strong> <strong>Unmet</strong> <strong>Public</strong> Health Problem<br />

http://www.nap.edu/catalog/11617.html<br />

SLEEP PHYSIOLOGY 49<br />

Moe et al., 1991; Monk et al., 1995). However, both men <strong>and</strong> women have<br />

increased stage 1 <strong>and</strong> decreased REM sleep.<br />

Older people also experience a decrease in melatonin levels, which may<br />

be due to the gradual deterioration of the hypothalamic nuclei that drive<br />

circadian rhythms (<strong>An</strong>coli-Israel, 2005). The inability to maintain long sleep<br />

episodes <strong>and</strong> bouts of wakefulness may reflect, in addition to other medical<br />

factors, a continuously decreasing sleep homeostasis (Dijk et al., 2000;<br />

Bliwise, 2005). Other prominent factors are the continuous increase in sleep<br />

latency <strong>and</strong> nighttime awakenings <strong>and</strong> inconsistency of external cues such<br />

as light exposure (which tends to be low), irregular meal times, nocturia,<br />

<strong>and</strong> decreased mobility leading to a reduction in exercise (Dijk et al., 2000;<br />

<strong>An</strong>coli-Israel, 2005; Bliwise, 2005).<br />

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Copyright © National Academy of Sciences. All rights reserved.

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