Professor Steinberg Tells Her Class That During a Normal Sleep

 Professor Steinberg tells her class that during a normal sleep cycle, a person will progress from _____.

A) Stage 1 to 2, 3, and 4 before entering REM sleep.
B) Stage 4 to 3, 2, and 1 before entering REM sleep.
C) Stage 1 to 4 then back to 3 and 2, and then entering REM sleep.
D) Stage 1 to 4 at the beginning of the night. Later on, the cycle is Stage 1 and 2 and then REM.

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