insomnia


noun

  1. inability to obtain sufficient sleep, especially when chronic; difficulty in falling or staying asleep; sleeplessness.

noun

  1. chronic inability to fall asleep or to enjoy uninterrupted sleepRelated adjective: agrypnotic
n.

1620s, insomnie, from Latin insomnia “want of sleep,” from insomnis “sleepless,” from in- “not” (see in- (1)) + somnus “sleep” (see Somnus). The modern form is from 1758.

n.

  1. Chronic inability to fall asleep or remain asleep for an adequate length of time.

  1. Chronic inability to fall asleep or remain asleep for an adequate length of time.

A persistent and prolonged inability to sleep.

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