Multiple Choice
When people stay awake for 3 days in a row,how does their sleepiness vary over time?
A) It increases each night and decreases the next morning.
B) It increases steadily as time passes.
C) It increases and decreases on a 90-minute cycle.
D) It increases for the first 24 hours and then remains constant.
Correct Answer:

Verified
Correct Answer:
Verified
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