Sorry I got distracted while I was chatting, I then lost the e-mail addy as I logged out of chat, I couldn't find you on the forum to inbox you.
What I meant by trapping the nerve, or maybe pressure on a nerve would explain it better could cause the shaking sensation you described when you lie down.
If you make a post some other members maybe have similar issues too and can help
Hope to see you in chat again soon
Liz, Spine-health Moderator
Spinal stenosis since 1995
Lumber decompression surgery S1 L5-L3
Cervical stenosis, so far avoided surgery