Etymology
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insomnia (n.)

"chronic inability to sleep," 1620s, insomnie, from Latin insomnia "want of sleep, sleeplessness," from insomnis "sleepless," from in- "not" (see in- (1)) + somnus "sleep" (from PIE root *swep- "to sleep"). The re-Latinized form is from 1758.

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Definitions of insomnia

insomnia (n.)
an inability to sleep; chronic sleeplessness;
From wordnet.princeton.edu