Sahih Bukhari
Sahih Bukhari Volume 002, Book 016, Hadith Number 111.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 16. Witr Prayer
Narated By 'Aisha : The Prophet (p.b.u.h) used to offer his night prayer while I was sleeping across in his bed. Whenever he intended to offer the Witr prayer, he used to wake me up and I would offer the Witr prayer too.