Etymology

microsleep

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Today it means: A brief period of sleep, usually of a few seconds, that may result from sleep deprivation or various medical conditions. Full definition →

First used 20th c.
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The story

From micro- + sleep.

First known use, by meaning

  • from 20th c. A brief period of sleep, usually of a few seconds, that may result from sleep deprivation or various medical conditions.

Etymology from Wiktionary, CC BY-SA 4.0.