Abu Hurairah (RA) reported: The Messenger of Allah PBUH said, “When any one of you sleeps, Satan ties three knots at the back of his neck. He recites this incantation at every knot: `You have a long night, so sleep.’ If he awakes and remembers Allah, one knot is loosened. If he performs Wudu’, the (second) knot is loosened; and if he performs prayer, (all) knots are loosened. He begins his morning in a happy and refreshed mood; otherwise, he gets up in bad spirits and sluggish state.”
(Bukhari and Muslim)
