Sleep phase, for short - Crossword Clue

Below are possible answers for the crossword clue Sleep phase, for short.

3 letter answer(s) to sleep phase, for short

REM
  1. (Roentgen Equivalent Man) the dosage of ionizing radiation that will cause the same amount of injury to human tissue as 1 roentgen of X-rays
  2. a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep

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