rapid eye movement

Researchers found no evidence that slumbering longer at any one stage of sleep affected brain functions, contradicting a long-debated hypothesis that rapid eye movement or REM sleep is more beneficial to healthier brain function.

They have long thought these insights came from the rapid eye movement stage of sleep, which is rich with dreams and begins an hour or more into the sleep cycle.

You never enter restful rapid eye movement sleep, since you have spent the night basically holding your breath.

While in rapid eye movement, or REM, sleep, which is the deepest stage of sleep, the seals stayed upside down, oblivious to their slow descent.

Sleeping for longer, uninterrupted periods of time allows for REM sleep, a period of unconscious rapid eye movement that corresponds with high activity in the brain.