orthodox sleep

n.
Sleep characterized by a slow alpha rhythm and the absence of REM.

(ôr'thə-dŏks')
n.

Sleep characterized by a slow alpha rhythm and the absence of REM.

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The noun has one meaning:

Meaning #1: a recurring sleep state during which rapid eye movements do not occur and dreaming does not occur; accounts for about 75% of normal sleep time
  Synonyms: nonrapid eye movement sleep, NREM sleep, nonrapid eye movement, NREM

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