Sleep and Dreaming

AP Psychology· difficulty 4/5

Across a typical night, REM sleep

A
$Occurs only once, during the very first sleep cycle$
B
$Decreases in length and frequency as the night progresses$
C
$Increases in length and frequency in later cycles$
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D
$Stays roughly equal in duration across all sleep cycles$

Explanation

Early cycles have more deep NREM; later cycles have more REM.

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