The percentage of a night's sleep devoted to rem sleep
a) increases during childhood and adolescence.
b) increases during middle and late adulthood.
c) decreases during childhood and adolescence.
d) peaks in early adulthood.

A) increases during childhood and adolescence.

Explanation:

Rapid eye movement sleep is a significant phase of sleep in which the movement of the eyes occurs randomly during the sleep. Such sleep increases the propensity to have a vivid dream. During childhood, the percentage of REM sleep during night increases. During adulthood, it remains constant while it starts to decrease in late adulthood.