hypersomnia

English Thesaurus

1. an inability to stay awake (noun.state)

hypernym	:	sleep disorder,
definition	:	a disturbance of the normal sleep pattern (noun.state)

hyponym	:	catalepsy,
definition	:	a trancelike state with loss of voluntary motion and failure to react to stimuli (noun.state)

hyponym	:	narcolepsy,
definition	:	a sleep disorder characterized by sudden and uncontrollable episodes of deep sleep (noun.state)

antonym	:	insomnia,
definition	:	an inability to sleep; chronic sleeplessness (noun.state)

antonym	:	insomnia,
definition	:	an inability to sleep; chronic sleeplessness (noun.state)