Causes of Vertigo. Vertigo is often caused by an inner ear problem. Some of the most common causes include: BPPV. These initials stand for benign paroxysmal positional vertigo. BPPV occurs when tiny calcium particles (canaliths) clump up in canals of the inner ear.
I think the pain is worse at night because of the activity during the day. I do experience pain at night (and throughout the day off & on). It makes it hard to go to sleep at night plus in the middle of the night the pain wakes me up.
Some people feel worse during the day than at night. Among all the other good reasons listed here (end of the day, circadian rhythms, etc.) I think there's an additional reason: I had an allergist tell me it has to do with ions in the air, and the ions are charged differently in the day than they are at night.