The human sleep cycle repeats itself about every
A) 30 minutes.
B) 90 minutes.
C) 2 1/2 hours.
D) 4 hours.
Answer: B
The human sleep cycle repeats itself about every
A) 30 minutes.
B) 90 minutes.
C) 2 1/2 hours.
D) 4 hours.
Answer: B
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