Hadith 1132
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, when a servant sleeps, Satan ties three knots upon him. Then, if he wakes up during the night and remembers Allah, one knot is untied; if he performs ablution, two knots are untied; then if he performs two units of prayer, all the knots are untied. Therefore, untie the knots of Satan, even if it is with just two units of prayer."