It is narrated from Sayyida Aisha (may Allah be pleased with her) that when the Messenger of Allah (peace and blessings be upon him) was unable to perform the night prayer due to sleep overcoming him or some ailment, he (peace and blessings be upon him) would perform twelve units of prayer during the day.

Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: Whoever misses the Witr prayer due to sleep or forgetfulness, then whenever he remembers or wakes up, he should perform the Witr.

It is narrated from Sayyiduna Qais bin Amr (may Allah be pleased with him) that he came for the Fajr prayer and found the Noble Prophet (peace and blessings be upon him) in the Fajr prayer, while he had not performed the two Sunnah of Fajr. So he prayed with the Prophet (peace and blessings be upon him), and when the Fajr prayer was finished, he stood up to perform the Sunnah of Fajr. When the Prophet (peace and blessings be upon him) passed by him, he asked: "Which prayer is this?" He informed the Prophet (peace and blessings be upon him), and the Prophet (peace and blessings be upon him) remained silent and did not say anything.

It is narrated from the wife of the Messenger, Sayyida Maymunah (may Allah be pleased with her), that two rak'ahs before Asr were missed by the Noble Prophet (peace and blessings be upon him), so he (peace and blessings be upon him) performed them after Asr.