The power to use Sleep-related magic. Variation of Sleep Manipulation. Form of Magic. Not to be confused with Dream Magic.
The user is able to perform a legendary form of magic that allows them to cast magical spells related to sleeping, dreaming and nightmares.
The Sandman (Eurpopean Folklore)
Queen Regina (Once Upon a Time) is experienced in the use of a powerful sleeping curse, having used it more than once.
Sanderson Mansnoozie (Rise of the Guardians) has the power to put children to sleep with his magical sand.