Sahih Muslim Book 4, Hadith Number 1352.

Chapter : Time for the night prayer and its delay.

Abu Barza b. Aslami is reported to have said: The Messenger of Allah (may peace be upon him) delayed the night prayer till a third of the night had passed and he did not approve of sleeping before it, and talking after it, and he used to recite in the morning prayer from one hundred to sixty verses (and completed the prayer at such hours) when we recognised the faces of one another.