Abu Dawud Book 2, Hadith Number 713.

Narated By ‘Aisha, Ummul Mu’minin : I used to sleep lying between the Apostle of Allah (PBUH) and the qiblah. The Apostle of Allah (PBUH) used to pray when I (was lying) in front of him. When he wanted to offer the witr prayer – added by the narrator Uthman – he pinched me – then the narrators are agreed – and said: Set aside.