HYPERSOMNIA

Pronunciation (US): (GB):

Meaning:

An inability to stay awake

Classified under:

Nouns denoting stable states of affairs

Hypernyms ("hypersomnia" is a kind of...):

sleep disorder (a disturbance of the normal sleep pattern)

Hyponyms (each of the following is a kind of "hypersomnia"):

catalepsy (a trancelike state with loss of voluntary motion and failure to react to stimuli)

narcolepsy (a sleep disorder characterized by sudden and uncontrollable episodes of deep sleep)

Antonym:

insomnia (an inability to sleep; chronic sleeplessness)