Umm Salama said that God’s Messenger awoke one night with a start and said, “Glory be to God. What treasures have been sent down tonight, and what trials have been sent down! Who will waken those who are in the inner chambers (meaning his wives) in order that they may pray? Many a woman who is clothed in this world will be naked in the next.”
Ibn Mas'ud said that a man was mentioned in the Prophet’s presence, and he was told that he continued sleeping till morning, never having got up to pray. He said, “That is a man in whose ear (or, in whose ears) the devil has urinated.”
Narrated Abu Huraira reported God’s Messenger as saying:
Our Lord who is blessed and exalted descends every night to the lowest heaven when two-thirds of the night have passed and says, “Who supplicates me so that I may answer him? Who asks of me so that I may give to him? Who asks my forgiveness so that I may forgive him?”
(Bukhari and Muslim.) In a version by Muslim it is said that He then spreads out His hands and says, “Who will lend to One who is neither indigent nor unjust?"* till the dawn breaks.
*The lending mentioned here is presumably the doing of good works.
Al-Mughira said that the Prophet got up at night to such an extent that his feet became swollen. On being asked why he did this when his former and latter sins had been forgiven him, he replied, “Should I not be a grateful servant?”