Sleepy Princess in the Demon Castle poster

Sleepy Princess in the Demon Castle (2020)

Animation · Comedy · Fantasy

When young Princess Syalis is kidnapped and imprisoned by the Demon King, she's rather indifferent about her situation. But she quickly comes to a terrible realisation—she can't sleep soundly in such an uncomfortable bed! She soon escapes her cell and sets off in search of ways to improve her sleep quality, leaving the castle's inhabitants, and even the Demon King himself, scrambling to keep the unruly princess out of trouble during her chaotic adventures.

IMDb rating: 7.5 (1,051 votes)
Episode average: 8.0 ↑ +0.5 vs IMDb
Seasons: 1
Streaming (US): Crunchyroll
Language: JA
Type: TV series

Rating trend: this show's seasons do not settle into one shape. Rising Shows ranks whole shows by the shape of their rating trend rather than one average score, which is how you find a show that got better rather than a show that started well.

Browse shows by rating shape → Open in Rising Shows app → View on IMDb

Ratings refreshed Oct 3, 2026 · 1 season indexed

Cast

Seasons

Season 1 (2020)

8.03 avg 12 episodes 7.5 → 8.3 23 min avg

Season 1 episodes - IMDb ratings
#	Title	Rating	Votes
1	Sleepless Princess of the Castle	7.5	75
2	The Princess and Furious Fluff	7.7	63
3	The Princess and Forbidden Knowledge	7.8	61
4	The Princess, Destruction, and a Short Journey	7.7	59
5	The Princess and Female Warriors	7.8	57
6	The Princess' Unwavering Choice	8.1	58
7	Even More Sleepless Princess of the Castle	8.6	65
8	The Princess and the Frightful Demon Nightmare	8.1	55
9	The Princess and Hostage Training Week	8.5	63
10	The Princess in Endopolis	8.2	54
11	The Princess and Troubling Dreams	8.0	56
12	Sleeping Princess of the Demon Castle	8.3	57