Card 45 / 54: Which best characterizes the proportion of sleep in a night? Which best characterizes the proportion of sleep over a lifetime?
A) More REM sleep earlier in a night than later; more REM sleep in old age than in infancy
B) More REM sleep later in a night than earlier; more REM sleep in infancy than old age
C) More REM sleep earlier in a night than later; more REM sleep in infancy than in old age
D) More REM sleep later in a night than earlier; more REM sleep in old age than infancy.

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