Sounds similar to "auditory sleep start" aka. "exploding head syndrome". The sensation of falling which makes you twitch from your whole body is "sleep start" o

Sounds similar to "auditory sleep start" aka. "exploding head syndrome". The sensation of falling which makes you twitch from your whole body is "sleep start" or "hypnic jerk" (who comes up with these names). There is also a visual version where one experiences flashes.