Etymology

NREM

N1R1E1M3

Today it means: Non-rapid eye movement, non-REM; designating the stage or stages of sleep when there is no dreaming and brain activity is reduced. Full definition →

First used 20th c.
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The story

Initialism of non-rapid eye movement.

First known use, by meaning

  • from 20th c. Non-rapid eye movement, non-REM; designating the stage or stages of sleep when there is no dreaming and brain activity is reduced.

Etymology from Wiktionary, CC BY-SA 4.0.