Narrated Abu Hurairah: The Messenger of Allah صلی اللہ علیہ وسلم as saying: When one you sleeps, the devil ties three knots at the back of his neck, sealing every knot with, You have a long night, so sleep. So if one awakes and mentions Allah, a knot will be loosened; if he performs ablution another knot will be loosened; and if he prays, the third knot will be loosened; and in the morning he will be active and in good spirits; otherwise he will be in bad spirits and sluggish.