When one of you dozes in prayer he should sleep till his sleep is gone, for when one of you prays while he is dozing, perhaps he might curse himself if he begs pardon of Allah.
The Messenger of Allah (ﷺ) as saying: When one of you gets up by night (to pray), and falters in reciting the Qur'an (due to sleep), and he does not understand what he utters, he should sleep.
The Messenger of Allah (ﷺ) entered the mosque (and saw that) a rope tied between two pillars. He asked: What is this rope (for) ? The people told him: This is (for) Hamnah b. Jahsh who prays (here). When she is tired, she reclines on it. The Messenger of Allah (ﷺ) said: She should pray as much as she has strength. When she is tired, she should sit down. This version of Ziyad has: He said: What is this ? The people told him: This is for Zainab who prays. When she becomes lazy, or is tired, she holds it. He said: Undo it. One of you should pray in good spirits. When he is lazy or tired, he should sit down.
The Messenger of Allah (ﷺ) as saying: He who misses him daily round of recital or part of it due to sleep and he recites it between the dawn and the noon prayers, will be reckoned as if he recited it at night.
The Prophet (ﷺ) said: Any person who offers prayer at night regularly but (on a certain night) he is dominated by sleep will be given the reward of praying. His sleep will be almsgiving.
The Messenger of Allah (ﷺ) as saying: Our Lord who is blessed and exalted descends every night to the lowest heaven when the last one-third of the night remains, and says: Who supplicated 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 ?
حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، حَدَّثَنَا أَبُو الأَحْوَصِ، ح وَحَدَّثَنَا هَنَّادٌ، عَنْ أَبِي الأَحْوَصِ، - وَهَذَا حَدِيثُ إِبْرَاهِيمَ - عَنْ أَشْعَثَ، عَنْ أَبِيهِ، عَنْ مَسْرُوقٍ، قَالَ سَأَلْتُ عَائِشَةَ - رضى الله عنها - عَنْ صَلاَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَقُلْتُ لَهَا أَىُّ حِينٍ كَانَ يُصَلِّي قَالَتْ كَانَ إِذَا سَمِعَ الصُّرَاخَ قَامَ فَصَلَّى .
I asked 'Aishah about the prayer of the Messenger of Allah (ﷺ), and I said to her: At what time he prayed at night ? She said: When he heard the cock crow, he got up and prayed.