Sleep and Dreaming

AP Psychology· difficulty 4/5

Which trend across the night does the hypnogram show?

A
$REM occurs only at sleep onset$
B
$N3 dominates the final third of sleep$
C
$REM periods lengthen and N3 (deep sleep) decreases later in the night$
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D
$Stages cycle randomly with no temporal pattern$

Explanation

A normal hypnogram shows that slow-wave sleep (N3) is concentrated in the first cycles, while REM episodes become longer and more frequent toward morning.

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