Last week I had vertigo/dizziness when I was trying to sleep, and it prevented me from sleeping all night (see previous question) I thought it could be down to a bug or the fact I drank a couple glasses of coke so the caffeine was keeping me awake. But it happened again last night, it didn't keep me up all night, but for a good few hours and I definitely recognised the feeling being the same as the one last week. When it occurs its only when lying down and with my eyes shut its almost like a falling feeling and then I have to open my eyes/move/walk around to stop it. I dont have any ear pain so I don't think its an ear infection. I am always having sinus problems (I believe) and I suffer from hayfever. I don't have any severe headaches or anything. Just would like to know whats causing it and how to treat it if it happens again? Or if it will go away on its own. Any suggestions would be great. Thank you