Till Sun Rises.

Peder runs into his ex-girlfriend Hanna one day. They're happily married with new partners but although many years has passed Peder and Hanna are still attracted to each other. However, they don't want to jeopardize their marriages or cheat. One day they come across an antique book about dreams. With the help of the book, they manage to enter a dream world where they can live together in a life where anything is possible, while living their normal lives during the day. But soon enough it becomes hard to separate the dream world from reality.