During an ordinary night's sleep, the usual sequence of sleep stages is:

Question

Quizplus · Accepted Answer

The correct sequence of sleep stages during an ordinary night's sleep is 1-2-3-4-3-2-REM, with each sleep stage being held for varying amounts of time throughout the night. This means that sleep begins with stage 1, progresses to stage 2, then 3 and 4, before cycling back through stages 3 and 2, and then on to the REM stage. This cycle repeats throughout the night, with longer periods of REM sleep occurring later in the night.

During an Ordinary Night's Sleep, the Usual Sequence of Sleep