Jamie feels most alert between 9:00 pm and 1:00 am, and then falls asleep until 9 a.m. This is a pattern that is consistent from day to day. It can be described as Jamie's
A) melatonin level.
B) sleep-alert cycle.
C) level of insomnia.
D) circadian rhythm.
E) sleep-wake level.
Correct Answer:
Verified
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