REM sleep
Rapid Eye Movement sleep, a stage of the sleep cycle where most dreaming, including nightmares, occurs. The body is paralyzed during this stage.
Videos Mentioning REM sleep

Andrew Huberman: Sleep, Dreams, Creativity, Fasting, and Neuroplasticity | Lex Fridman Podcast #164
Lex Fridman
Rapid Eye Movement sleep, characterized by intense brain activity, high metabolic rates, dream content with strong emotional themes, and temporary paralysis.

The Psychology of Nightmares
Eternalised
Rapid Eye Movement sleep, a stage of the sleep cycle where most dreaming, including nightmares, occurs. The body is paralyzed during this stage.

Consciousness and the Physical World: A Conversation with Christof Koch (Episode #374)
Sam Harris
A stage of sleep characterized by rapid eye movements and vivid dreams.

Exploring Consciousness, Sensory Augmentation, The Lazy Susan Method of Productivity, and More
Tim Ferriss
Rapid eye movement sleep, which correlates with dreaming. David Eagleman and his student hypothesize that REM sleep's function is to blast random activity into the visual cortex to defend it against takeover by other senses during darkness.

How to Learn Better & Create Your Best Future | Tim Ferriss
Andrew Huberman
Rapid Eye Movement sleep, which Tim Ferriss explored in a paper during college for potential similarities with the effects of LSD.