Christopher is in medical school, and his residency requirement calls for him to work 28 hours straight before havin
time off. When he gets done with this shift, he finds it difficult to go right to sleep. He keeps up this schedule for
nearly a year, when he realizes he no longer has a problend falling asleep. Which of the following is this an example
of?

A. Christopher has adjusted to a longer than normal day cycle with regard to work and sleep.

B. Christopher has adjusted to a shorter than normal day cycle with regard to work and sleep.

C. Christopher is no longer affected by his long work hours because he spends more time in non-REM sleep.

D. Christopher is no longer affected by his long work hours because he spends more time in REM sleep.
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