Which of the following is the most likely order of sleep stages during the first 90 minutes of a night of rest?
A) Stages 1-2-3-4-1-2-3-4-REM
B) Stages 1-2-3-4-REM-1-2-3-4
C) Stages 1-2-3-4-3-2-REM
D) Stages REM-4-3-2-1

Question

Quizplus · Accepted Answer

During the first 90 minutes of sleep, the progression typically follows stages 1, 2, 3, and 4, then reverses from stage 4 back through stages 3 and 2 before entering REM sleep. This pattern reflects the cyclic nature of sleep architecture, particularly in the early part of the night.

Which of the Following Is the Most Likely Order of Sleep