I get these sensations almost every night since my accident. I have reversal and radiculopathy at c4, c5 and c6. The orthopedic surgeon wants to do fusion surgery, but I want my head injury/migraine/VM addressed first.
Anyway, I’m usually up 3-6 times a night alternating ice/heat on neck/back. I do gentle yoga stretches some nights when it’s really bad.
There is more information related to this under a topic called “Body Vibrations” that you may want to check out.
I hope I copied this link OK: Body vibrations
I’m not sure if mine is coming from my neck injury or migraine/VM, but I can definitely relate to the spinal sensations especially at night.