In "Sleepy Princess in the Demon Castle (2020)," follow the mischievous yet lovable Princess Syalis as she finds herself trapped in a demon castle. Despite the daunting setting, Princess Syalis is determined to make the best of her situation and ensure she gets a good night's sleep every night. With her trusty teddy bear in tow, she embarks on hilarious escapades to secure the most comfortable and luxurious bedding materials, much to the dismay of the castle's demon residents. As Princess Syalis navigates through the challenges of castle life, she forms unexpected bonds with the demons and discovers that there is more to them than meets the eye. Through her unconventional methods and relentless pursuit of the perfect sleep, she brings a unique blend of chaos and charm to the demon castle. Join Princess Syalis on her whimsical adventures filled with humor, heartwarming moments, and a touch of mischief in this delightful anime series. "Sleepy Princess in the Demon Castle" offers a refreshing twist on the typical princess narrative, showcasing the power of determination and the importance of finding comfort even in the most unlikely of places.