Fiction books for someone who loves textbook level non fiction but wants wind down stories that tell a good story

I tend to literally read textbooks or non fiction before bed but want something where I can see a movie in my head without leaning towards real wacky fiction books that take forever to pick up or have too many details I need to remember.

I read to combat my awful sleep quality and let my brain wind down without screens. The book should be the kind of calming stories you'd get from a children's book so that my heart isn't racing before bed… but for adults. The kind you can kinda read semi brain dead and just purely for a calm fun story to get you primed for dreamland.