Evil in general does not sleep, and therefore doesn’t see why anyone else should. But Crowley liked sleep, it was one of the pleasures of the world. Especially after a heavy meal. He’d slept right through most of the eighteenth century, for example. Not because he needed to, simply because he enjoyed it.

Terry Pratchett & Neil Gaiman,
Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch