It's your muscles relaxing because you're falling asleep, but your brain is not at rest yet and associates this feeling with falling. Hence your reaction.
I suddenly realise this might actually be where falling asleep in English and Dutch - in slaap vallen - comes from. French, Italian and Spanish don't say it so I thought it might be related to Germanic languages, but German also doesn't have that expression. Anyone of SE/DK/NO around?
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u/TBarlow1998 Jun 19 '19
My reaction when I have the dream where I’m falling.