Tahajjud

‘Ā’ishah (may Allah be pleased with her) reported: I used to sleep in front of the Messenger of Allah (may Allah's peace and blessings be upon him) with my legs in his prayer direction. When he wanted to prostrate, he would prod me so that I withdraw my feet, and when he stood up, I would stretch them. In those days, houses had no lamps.

‘Ā’ishah (may Allah be pleased with her) reported that the Prophet (may Allah's peace and blessings be upon him) said: "When one of you feels drowsy during prayer, let him lie down till drowsiness goes away from him, because when one of you performs prayers while feeling sleepy, unknowingly instead of seeking forgiveness he might abuses himself."

Abu Salamah ibn ‘Abdur-Rahmān (may Allah have mercy upon him) reported that he asked ‘Ā'ishah (may Allah be pleased with her) how the Prophet's prayer was in Ramadan. She said: "Neither in Ramadan, nor in any other month, did the Messenger of Allah (may Allah's peace and blessings be upon him) exceed the eleven Rak‘ahs of prayer. He would pray four – and do not ask about their beauty and length; then he would pray another four, and do not ask about their beauty and length either, then he would pray three." ‘Ā'ishah then added: "I asked him: 'O Messenger of Allah, do you sleep before performing the Witr prayer?' he said: 'O ‘Ā'ishah, indeed, my eyes sleep but my heart does not sleep.'"

Ibn ‘Umar (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "(Voluntary) prayer in both the day and night is performed two by two."