I’ll try to keep it simple.
Animals sleep at night to repair their bodies and to conserve energy.
An evolutionary response was to “dream” during this sleep process.
Dreaming is used to sort through memories and to “simulate” potential situations which you may encounter in real life.
In order for your brain to “play the video game of a dream” it needs to move it’s body virtually, without physically moving, hence animals have adapted to self paralyze themselves while dreaming. Coincidentally, there is not drawback to eyes moving while dreaming (no potential danger) so that’s why they move so freely.
During dreams, eye movement (proved by lucid dreamer Stephen Laberge) mimic the exact same eye movement in real life.
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