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Elderly peopleSleep and circadian rhythms change dramatically withage [20]. Sleep problems are very common in elderlypeople, affecting their quality of life. As in young adults,a brief nap is believed to improve alertness andperformance in the elderly, too. Indeed, according toa study by Tamaki and colleagues (2000) [12], elderlysubjects (mean age, 73 years) showed reduced sleepinessand fatigue and improvement in performance in avisual detection task after a 34-min nap commencing at13:00 h (polysomnographically de®ned sleep of24 min). These effects of napping were observed forthe subsequent 2 h. Actigraphic monitoring of theseelderly subjects over a 1-week period also revealedthat they took 4.6 naps per week, and that each napstarting at 13:51 h, on average, lasted for 38 min.Notably, there were no signi®cant differences innocturnal sleep variables between nap days and no-napdays, which suggests the absence of any interferencewith the following night's sleep.
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