“Benign paroxysmal positional vertigo (BPPV) is one of the most common causes of vertigo — the sudden sensation that you’re spinning or that the inside of your head is spinning.BPPV causes brief episodes of mild to intense dizziness. It is usually triggered by specific changes in your head’s position. This might occur when you tip your head up or down, when you lie down, or when you turn over or sit up in bed.”

MAYO CLINIC