A Student Claims That He Has Severe Insomnia and Hardly

Multiple Choice

A student claims that he has severe insomnia and hardly sleeps at all. The fact that his roommate says that he appears to sleep deeply and is not even bothered by dorm noises when he is asleep suggests that the student's condition is most probably

A) non-REM sleep.
B) paradoxical insomnia.
C) narcolepsy.
D) sleep apnea.