Season 0 of Sleepy Princess in the Demon Castle premiered on October 8, 2020.

Mini: Chibi shorts released on the anime's official Twitter page.

Live 2D: Short animations of Princess Syalis sleep talking released on the anime's official Twitter page.

Season 1 of Sleepy Princess in the Demon Castle premiered on October 6, 2020.

A drowsy human princess roams the demon's castle where she's held prisoner, trying to find a comfortable place to get a good night's sleep.