Hope...and others with vertigo. This is about two years after your post. It's July, 2008, but your symptoms are very much like mine and I do believe it is whats called BPPV. Your right. It happens mostly to older folks and mostly when getting into bed or out of bed. Looking up and reaching will also do it. Looking down or under something can do it. Getting in and out of a dentist chair will do it to you. There is a sensation that you have completely lost your ability to walk or stand up, usually for at least 10 or so seconds. I have to sit on the side of the bed, or dentist chair for just a little bit, about 15 or so seconds before I can get up. That give the brain time enough to let it level out. It is just for a few moments. The main thing is to keep the head level most of the time as moving the head up or down ..or sideways can cause the imbalance. This is the most probable cause, even though tumors and a stroke could do the same thing. But I dont think it would be ongoing if it were those two things. But only a neurologist can be sure. I do advise for you our anyone to let a doctor check you out. I have an appointment next month to verify this to me. Also I have MS, which could have triggered mine also. Hope this helps.