Sahih Al Bukhari Hadith Number 997

Narrated `A’isha: The Prophet (peace be upon him) 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.

14  Witr Prayer
Hadith number 997
Volume no 2
Chapter: 3 (The Prophet (peace be upon him) used to wake his family up for the Witr prayer)