Elevator Music

Dreadfully boring elevator music plays in a 30-foot radius Sphere centered on a point within range that you can see.  Whenever a creature is in the Sphere when you cast the spell, and whenever a creature enters the Sphere, it must attempt a Wisdom saving throw.  On a failure, it falls Unconscious for the spell's duration, or until it takes damage or another creature uses its action to slap or shake the creature awake.  A creature only attempts this saving throw once per round.