Which sleep pattern stage diminishes as an effect of aging?
a. Stage I
b. Stage II
c. Stage III
d. Stage IV
ANS: D
As we age, stage IV sleep diminishes. Many people older than 75 years do not demonstrate any stage IV sleep patterns. Between 2% and 5% of sleep is stage I. Stage II comprises about 50% of normal sleep time. Stage III is a transition between lighter sleep and deeper sleep.
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