I have same symptoms when getting up after sleeping in bed. Not every day, just sometimes. Mild vertigo or nausea. Gradually goes away after getting up.
I have been suspecting cause is my head position during sleep. Seems to occur when I wind up on my back, not on my side.
Sorry, I have no answers. Just had X-rays of my neck due to pain. Findings show multiple degenerative cervical issues. Maybe
it’s the cause; don’t know. Have yet to follow up with Drs.