sleep seizure
n. A long period of unexpected sleep.

Example Citation:
"Although Raines has obstructive sleep apnea, sleep deprivation, for whatever reason, can put a person in potentially lethal situations by impairing performance or causing unexpected sleep seizures, Maas said."
—Janet Perez, "Give It A Rest; Most Sleep-Deprivation Problems Solved By Going To Bed Earlier," The Arizona Republic, April 16, 1998

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