REM vs. NREM — What's the Difference?

The twitching movements of the eye muscles and other physiological changes that occur during REM sleep.

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

The amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays.

A unit for measuring absorbed doses of radiation, equivalent to one roentgen of x-rays or gamma rays.

Initialism of rapid eye movement, a sleep state.

A dose of absorbed radiation equivalent to one roentgen of X-rays or gamma rays.

(computing) A remark; a programming language statement used for documentation (in BASIC for example); also used in DOS batch files.

(web design) A unit relative to the declared font size of the root element in a HTML document.

(knitting) remaining.

A recurring sleep state during which dreaming occurs; a state of Rapid Eye Movements during sleep

(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