NREM

Initialism of non-rapid eye movement.

• (UK) IPA^(key): /ˈɛnɹɛm/, /ˈɛnɑːiːˌɛm/

NREM (uncountable)

1. (medicine, chiefly attributive) Non-rapid eye movement, non-REM; designating the stage or stages of sleep when there is no dreaming and brain activity is reduced. [from 20th c.]
   • 2017, Matthew Walker, Why We Sleep, Penguin, published 2018, page 45:

     [A] key function of deep NREM sleep, which predominates early in the night, is to do the work of weeding out and removing unnecessary neural connections.

• REM

• Non-rapid eye movement sleep on Wikipedia.Wikipedia