Anytime i lay down and open my eyes, i get dizzy getting up. it can be in the afternoon or morning. why?

Dizzy on getting up: Anytime I lay down and open my eyes, I get dizzy getting up. It can be in the afternoon or morning. Why? ANS: Ah that is the question. Need much more details and need to look at your eye movements upon getting up. So have your Dr. test you for positional nystagmus or a fall in BP when you stand. I am here till 4 AM PDT and can look at you eyes right after you get up and see what is going on.