Marshall has been diagnosed with non-24-hour type circadian rhythm sleep-wake disorder. Which of the following is a likely symptom of Marshall's disorder?
A. He sleeps in three periods within 24 hours.
B. He falls asleep suddenly in the middle of the day.
C. He often cannot sleep for up to 48 hours.
D. He experiences a free-running sleep-wake cycle that is not calibrated with the light-dark cycle of the day.
Answer: D
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