insomnia

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun an inability to sleep; chronic sleeplessness

Etymology

Borrowed from Latin īnsomnia, from Latin in- (“without”) + somnus (“sleep”, noun) + -ia, equivalent to in- + somn- + -ia.

In classic literature

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