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Age-related reduction in the maximal capacity for sleep--implications for insomnia
Elizabeth B Klerman1, Derk-Jan Dijk
1Division of Sleep Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA. ebklerman@hms.harvard.edu
Current Biology : CB
|July 29, 2008
Summary
Older adults exhibit reduced daytime sleepiness and a shorter maximum sleep duration compared to younger individuals. This suggests age-related changes in sleep capacity, not just social factors, contribute to insomnia.
Area of Science:
- Gerontology
- Sleep Science
- Human Physiology
Background:
- Sleep patterns change significantly throughout life, with insomnia being common in older adults.
- The causes of age-related sleep alterations, including social, circadian, and homeostatic factors, are not fully understood.
Purpose of the Study:
- To investigate age-related differences in sleep propensity and capacity.
- To determine if older adults have a reduced ability to sleep when given extended opportunities.
Main Methods:
- Assessed habitual sleep duration at home.
- Quantified daytime sleep propensity, sleep duration, and sleep structure in a controlled inpatient setting.
- Provided extended sleep opportunities (16 hours daily) for 3-7 days to 18 older and 35 younger healthy adults.
Main Results:
- Older subjects showed lower daytime sleep propensity at baseline compared to younger subjects.
- Total daily sleep duration decreased during the study in both groups.
- Older subjects achieved a shorter asymptotic total sleep duration (7.4 hours) than younger subjects (8.9 hours).
Conclusions:
- Older adults have reduced daytime sleepiness and a diminished maximal sleep capacity.
- Age-related decreases in both REM and NREM sleep contribute to reduced sleep duration.
- These findings have significant implications for understanding insomnia in older populations.
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