Hello @ronaldtseng, Welcome to Connect. I can relate to being pre-diabetic but I don't have any experiences with vibrations when laying down or sleeping. There is another similar discussion you might find helpful:
-- Body vibrations when falling asleep or waking?
https://connect.mayoclinic.org/discussion/body-vibrations/

I did see some information that may be helpful if you have not already seen it:
"Why does my lower back keep vibrating?
Back spasms can be the result of injuries to the muscles, tendons, and ligaments in the back, or they can be related to more serious medical conditions. Heavy lifting is a common cause of back spasms."
-- What Is Creating the Tingling Sensation in My Back?:
https://www.healthline.com/health/tingling-in-back

Have you discussed the symptoms with your primary care doctor?