Shizukuu

Sleepy Princess in the Demon Castle is an anime about exactly what the title says. Princess Syalis was captured by demons and brought to the Demon Lord's Castle, but instead of acting as a prisoner, she wanders around, causing everyone trouble in her quests meant to improve her sleep.  The series is pretty episodic, as there's no main plot. There's just the princess' desire to sleep comfortably, which creates lots of hilarious(and troublesome) situations that the characters (usually the demons) find themselves in. Even though sometimes it was a bit ridiculous, I don't think there was one episode... See full review