One of common complains among older people is sleep disturbance. They frequently complain that they find it difficult to fall asleep or only can sleep for a few hours and wake more frequently during the night. It is still a big question for them and their families that need to be answered, whether these conditions are normal or abnormal in older people. Part I of five reviews on Sleep Disorder in Older People will highlight the changes in sleep pattern associated with aging
Sleep is a vital physiologic process with important restorative functions. Normal sleep progresses through several stages.
Aging is associated with several changes in pattern of sleep. Typically, there is a phase advance in the normal circadian sleep cycle: older people tend to go to sleep earlier in the evening but also to wake earlier; wake more frequently during the night and experience fragmented sleep. With aging, the total amount of time asleep shortens: infants and young children sleep an average of 16-20 hours per day; adults, 7-8; and people over 60 years of age, 6½ hours daily. Delta sleep (stage 3 and 4), the deepest and most refreshing form of sleep, diminishes with age.
In short, typical sleep changes with aging are as follows:decreased total nocturnal sleep time; delayed onset of sleep; advanced circadian phase: early to bed, early to rise; reduced slow-wave sleep; reduced REM-sleep; reduced threshold for arousal from sleep; fragmented sleep with multiple arousals; daytime napping.
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