‘Amr b. ‘Abasa reported God's Messenger as saying, “The nearest the Lord comes to a servant is in the course of the last part of the night, so if you are able to be among those who make mention of God at that hour, do so."
Tirmidhi transmitted it, saying that this is a hasan sahih tradition whose isnad is gharib.
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!”
Abu Umama reported God’s Messenger as saying, “Make a practice of getting up at night, for it was the custom of the pious before you, is a means of bringing you near to your Lord, an atonement for evil deeds and a preventative of sin."