Why do I get disoriented after waking up?

I am 24 and normally don't do this on a everyday basis. But sometimes when I wake up I get very disoriented or I have vertigo spells. Sometimes they last for about a hour or so. I also seem to hold conversations with my hubby but I don't make any sense and don't remember what was said. I'm not on any sleeping pills or pain meds. I did however just recently ran out of my vitamin D. Which I haven't had any kind of this weird behaviour in a while until this morning. So I'm not sure if it's somewhat related to my vitamin D or if maybe I am diabetic or maybe going nuts lol. Help.