Welcome @shaymomof3, You are definitely not alone. I haven't had the symptoms happen to me but have read the posts of others to know that there are many members discussing the same symptoms.

I shared a couple of links earlier in the discussion that I thought might be helpful in case you or others did not see them. @novajeff mentioned about similar symptoms in another discussion here – Has anyone experienced internal vibrations?: https://connect.mayoclinic.org/comment/231053/.

— Brain Zaps Anxiety Symptoms: https://www.anxietycentre.com/anxiety-disorders/symptoms/brain-zaps/
— What to know about sleep myoclonus: https://www.medicalnewstoday.com/articles/sleep-myoclonus

Have you discussed the symptoms with your doctor?

When mine first started happening I also thought about my heart but quickly ruled that out with monitoring. I also usually always stretch and change position in bed even though they come regardless of what position I am in initially. While stretching and moving it also makes me more awake and being awake makes them go away temporally until they come back as soon as a drop back into falling asleep mode. I find comfort knowing others are having similar experiences. Mine started after my second Covid vaccination (I never have had Covid that I am aware of) but that may just be a coincidence. Thanks for sharing

This started for me a couple months after having COVID but prior to receiving
any COVID vaccines.

Interestingly enough, I’ve had the same kind of vibrations right at sleep very similar to yours. Also similarly, I have a history of atrial fibrillation and flutter and thought I was going into afib. To the point where I pulled out my Kardia mobile device and checked but was in sinus rhythm.
I do think there is some cardiac connection, not a dangerous one but potentially involving the vagus nerve which has a role in both heart rhythm, afib and also sleep.
No connections for me to covid or vaccines as I’ve had these long before either of those were around. That’s my situation anyway, anecdotal but we’re talking about the nervous system and a CNS phenomenon that involves beta waves potentially, the vagus nerve and possibly even small amounts of adrenaline being introduced during the sleeping process.
The human body is as terrifying as it is amazing and fascinating but I just have to say thank you for mentioning the afib sensation because it caused me a lot of panic this morning and knowing others have sensed that reaction falsely (thinking it’s a flutter or arrhythmia) will give me some peace of mind as I’m jerked out of slumber to this vibrating sensation. Best of luck to you, here’s to permanent sinus rhythm.

I have had this happening for years too. Neurologists can’t figure out why. However, I have had insomnia for years and I think mine started when on the highest dose of Lunesta. It didn’t stop when I stopped the med either. I also find it disturbing! I also have been working the night shift for the last two years. I’m not sure if it’s making it worse but it definitely hasn’t improved any over time. I am not an anxious person, so I don’t think that is causing this. However, brain vibrations due definitely cause some anxiety🤣. I just want it to go away! It makes my insomnia worse.