The Dream of Lieschen Müller (1961)

Lieschen Müller is in her mid-20s, works a dull office job and fancies the handsome waiter from the diner down the street, wishing for a more exciting life. In a vivid, lucid dream she happens upon a gigantic fortune, allowing her to live out her wildest fantasies. Quickly, however, she realizes that that's not what makes her happy.