Abu Malik al-Ash‘ari reported God’s Messenger as saying, “In paradise there are rooms the outside of which can be seen from within and the inside from without which God has prepared for those who speak gently, provide food, observe frequent fasting, and pray during the night when people are asleep.”
Baihaqi transmitted it in Shu'ab al-iman and Tirmidhi transmitted something similar from ‘Ali. In his version it says “for those who speak pleasantly.”
Abu Umama said that God’s Messenger was asked which supplication was most readily listened to, and replied, “One made in the course of the latter part of the night, and after the prescribed prayers.”
‘Abdallah b. ‘Amr b. al-‘As reported God’s Messenger as saying to him, “Don’t be like so and so, ‘Abdallah. He used to get up during the night, then abandoned the practice.”
Abu Huraira' reported God’s Messenger as saying, “God show mercy to a man who gets up during the night and prays, who wakens his wife and she prays, but if she refuses sprinkles the water on her face! God show mercy to a woman who gets up during the night and prays, who wakens her husband and he prays, but if he refuses sprinkles the water on his face!”