Rapid Eye Movement (REM) Sleep is a unique phase of mammalian slumber characterized by random movement of eyes, low muscle tone throughout the body, and vivid dreams.
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Paradoxical Sleep: Another term for REM due to its paradoxical qualities; despite being deeply asleep our brains are highly active, almost as if we were awake.
Lucid Dreaming: A dream during which the dreamer is aware they're dreaming. These often occur during REM sleep when dreams are most vivid.
Sleep Paralysis: A temporary inability to move or speak while falling asleep or upon waking. This can happen when someone starts to wake up during REM sleep.