A disorder that interrupts normal sleep patterns and is characterized by repeated, brief jerks of the arms and legs that occur every 20 to 60 seconds during the beginning of sleep is called:
a. Insomnia
b. Narcolepsy
c. Hypersomnia
d. Nocturnal myoclonus
D
Nocturnal myoclonus consists of repeated, brief jerks, most often in the legs, that occur at the beginning of sleep and disrupts the normal sleep pattern. These movements generally decrease during stage 4 NREM sleep.
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