Which sleep stage begins the initial period of deep sleep?
a. 1
b. 2
c. 3
d. 4
C
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A Stage 1 is not the stage that begins the initial period of deep sleep.
B Stage 2 is not the stage that begins the initial period of deep sleep.
C Stage 3 is the stage that begins the initial period of deep sleep.
D Stage 4 is not the stage that begins the initial period of deep sleep.
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