It is narrated from Hazrat Thabit that Abu Thamir was a devout worshipper. One day, before performing the Isha prayer, he fell asleep. Then two angels came to him, or two men came to him in a dream, and one of them sat by his head and the other by his feet. Then the one at his head said to the one at his feet: "Praying before sleeping pleases the Most Merciful and angers Satan." And the one at his feet said to the one at his head: "Sleeping before prayer pleases Satan and angers the Most Merciful."