A policeman complains of feeling tired and not able to sleep for an extended period of time after being assigned to work the night shift.He is most likely suffering from:

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Circadian rhythm sleep disorder is a sleep disruption that results from a mismatch between body rhythms and environmental demands.Primary hypersomnia occurs when a person sleeps during the night but naps during the day.Narcolepsy results in repeated attacks of sleep,and obstructive sleep apnea is a breathing-related sleep disorder and not a change in sleep time.

A Policeman Complains of Feeling Tired and Not Able to Sleep