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Age differences in the spontaneous termination of sleep
P J Murphy1, N L Rogers, S S Campbell
1Laboratory of Human Chronobiology, Department of Psychiatry, Weill Medical College of Cornell University, White Plains, NY 10605, USA. pjmurphy@med.cornell.edu
Journal of Sleep Research
|March 25, 2000
Summary
Older adults awaken from different sleep stages than younger adults, with sleep quality influencing awakenings from REM sleep. Aging may alter sleep continuity and the need for REM sleep to transition to wakefulness.
Area of Science:
- Neuroscience
- Sleep Science
- Gerontology
Background:
- Sleep architecture and termination characteristics can vary with age.
- Understanding spontaneous awakenings is crucial for sleep research.
Purpose of the Study:
- To investigate age-related differences in sleep stages at spontaneous awakening.
- To examine the influence of circadian phase and preceding sleep quality on sleep termination.
- To explore the impact of aging on sleep termination characteristics.
Main Methods:
- 138 sleep episodes from 14 younger and 11 older adults were analyzed.
- Subjects were isolated from time cues and had limited behavioral options.
- Sleep stages, REM episodes, and sleep efficiency were recorded and compared between age groups.
Main Results:
- No age differences in total sleep duration or REM episode count/duration were found.
- Younger individuals preferentially awakened from REM sleep, unlike older individuals.
- Older adults with higher sleep efficiency were more likely to awaken from REM sleep.
Conclusions:
- Age-related differences exist in the sleep stage from which spontaneous awakenings occur.
- Sleep quality preceding termination may contribute to age-associated differences in awakening patterns.
- REM sleep characteristics suggest a role in facilitating wakefulness, potentially altered by aging.