It’s actually BPPV—or Benign paroxysmal positional vertigo. It’s nothing major (the episodes are only happening in bed when I tuen over and they only last a few seconds), but it is annoying.
Each part of the name describes a key part of the inner-ear disorder:
Benign means it’s not very serious. Your life is not in danger.
Paroxysmal means that it hits suddenly and lasts a short time.
Positional means you trigger the vertigo with certain postures or movements.
Hopefully it just stops on its own like it did the last time.