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
Answer: C
Rationale: At stage 4, the sleep cycle reverses toward stage 1 patterns, but does not go all the way back.
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