I’m glad I ran across this post. I have this myoclonic jerking. It was really bad a few years ago but thankfully subsided. The heavy flare up lasted about two years. It was worse as I was falling asleep. I too had my husband film it as I fell into a deep sleep. Neurologist said it was psychogenic. I literally wanted to choke the jerk. It as super worse when tired or stressed.

I hope yours too will subside.