It is narrated from Sayyiduna Abu Huraira, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "When a person goes to sleep, Satan ties three knots at the back of his head. With every knot, he strikes and says: 'You have a long night ahead, so sleep.' If the person wakes up and remembers Allah, one knot is untied. If he performs ablution, the second knot is untied. Then if he performs the morning prayer, the third knot is untied. Thus, that person remains cheerful and good-natured for the day; otherwise, he remains ill-tempered and lazy."