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Question

اصطلاح علمی خاصی داره ؟

Answer 1

Hi!

Maybe you're looking for "hypnic jerk" which causes that "falling sensation".

A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch or night start, or jump, is an involuntary twitch which occurs just as a person is beginning to fall asleep, often causing them to awaken suddenly for a moment.

A hypnic jerk is the feeling triggered by a sudden muscle twitch, causing the feeling of falling while sleeping or dreaming.

Fatigue, discomfort of the bed, highly intense exercise and stress might cause people to jerk during sleeping.

 

https://en.m.wikipedia.org/wiki/Hypnic_jerk

https://en.m.wikipedia.org/wiki/Falling_(sensation)

Answer 2

I believe that it has a definition in psychology, but I could translate it as: " Sensation of Instability, Slipping and Falling while Sleeping."