Sleepy Princess in the Demon Castle is a tV series anime that premiered in fall 2020, produced by Doga Kobo.

About the production: the story comes from a manga, there are 12 episodes of about 24 minutes and its current status is "finished".

Its main genres are comedy, fantasy and slice of life, with themes such as Ojou-sama, Female Protagonist, Prison and Episodic.

On AniList, Sleepy Princess in the Demon Castle has an average score of 78%, a very good score, and appears on 81,086 users' lists.

Sshhh! Princess Syalis is trying to get a good night's sleep. Some shut-eye. Forty winks. Catch some Z's. Long ago in olden times when people and demons lived together in—well, disharmony, really—a demon king kidnaps a human princess and imprisons her in his castle. Bereft, the princess's subjects beat their chests in anguish…until a hero arises to spearhead Project Rescue Our Princess! While waiting for her knight in shining armor, what's an imprisoned princess to do...? Teddy-bear guards with bat wings are all very well, but her dungeon cell is bo-o-o-ring! So, she decides to wile away the long hours by sleeping. Now if only she could get comfortable…and didn't suffer from insomnia... (Source: VIZ Media)

Official synopsis from AniList.