Musannaf Ibn Abi Shaybah

Ibn Abbas (may Allah be pleased with them both) used to say that when a person offers Witr at the beginning of the night and then wakes up in the last part of the night, he should add one rak'ah to the Witr, then perform prayer, and then offer Witr at the end of the prayer.

Hazrat Sha'bi narrates that Hazrat Ibn Umar (may Allah be pleased with them) used to do this.

Hazrat Amr bin Maymoon used to say the same.

Hazrat Usama bin Zaid and Hazrat Ibn Abbas (may Allah be pleased with them) used to say that when you get up to pray in the early part of the night, then pray as many units as you wish and pray in even units. Then make one rak'ah of Witr.

Hazrat Hisham states that Hazrat Urwah used to perform Witr in the early part of the night, and then when he would wake up at night, he would perform even-numbered rak‘ahs.

Hazrat Musa bin Talha narrates that Hazrat Usman used to combine one rak'ah with another rak'ah and used to say that I liken them to strange camels.

Hazrat Abu Qais Audi Abdur Rahman bin Tharwan narrates that I asked Hazrat Amr bin Maymoon about a person who offers Witr at night and then wakes up again, so what should he do? He replied that he should add one rak'ah to it.

Hazrat Mak’hool says that when a person offers prayers after Witr, he should pray in sets of two rak’ahs.