If you like Groundhog Day that much, you should check out the novel it was loosely inspired by, The Strange Life of Ivan Osokin by P.D. Ouspensky. Ouspensky isn't known as a novelist (he became a guru type) but up until the end where it gets a bit doctrinal, I thought it was a thoroughly delightful book. It's also a psychological tour de force, but I don't want to spoil the story by explaining why.