Caihadrice's Cone of Sleep

You exhale a sleep gas in a 45-foot cone. Each creature in that area must succeed on a Constitution saving throw against your spell save DC or fall unconscious for 5 minutes. This effect ends for a creature if the creature takes damage or someone uses an action to wake it.

When you cast this spell using a spell slot of 5th level or higher, double the duration for each slot level above 4th. When this spell is cast using a 9th level spell slot the sleep lasts until dispelled.