Antonyms of noun insomnia

1 sense of insomnia

Sense 1
insomnia -- (an inability to sleep; chronic sleeplessness)
       Antonym of hypersomnia (Sense 1)
      => hypersomnia -- (an inability to stay awake)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun insomnia

1 sense of insomnia

Sense 1
insomnia -- (an inability to sleep; chronic sleeplessness)
       => sleep disorder -- (a disturbance of the normal sleep pattern)