- paradoxical sleep, rapid eye movement sleep, REM sleep, rapid eye movement, REM - a recurring sleep state during which dreaming occurs; a state of Rapid Eye Movements during sleep
--1 is a kind of sleep, slumber
- REM - (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 is a kind of radioactivity unit