Vertigo. i have spinning when rolling over to both right and left sides in bed. is this common or does it usually happen to one side?

Typically one: The problem occurs in the inner ear, where there are semi-circular canals that respond to rotational movement. Occasionally they may become irritated or artificially stimulated and trigger the movement sensation. Just like when you were young and spun around real fast and then stopped but still felt like you were spinning. It mostly occurs on one side, but infection can impact both.