Yahya related to me from Malik that he had heard that A'isha, the wife of the Prophet, may Allah bless him and grant him peace, used to say, "If someone fears that he will sleep through till the morning, let him pray the witr before he sleeps, and if some one hopes to wake for the last part of the night, let him delay his witr
Hadith No. 271
Muwatta Malik
Gradings:
Salim al-Hilali:
Mauquf Daif