When Archimedes came up with the famous mathematical principle named after himself, he was taking a bath. When Newton came up with the Theory of Gravitation, he was taking a stroll in his garden and watched how an apple fell from a tree. Paul McCartney woke up with the song “Yesterday” in his head after a good night’s sleep. And many more creative people remarked that some of their best ideas came when they were not thinking about the problem but doing something else entirely, like relaxing or even sleeping.
