Sahih Muslim 763 d
The Book of Prayer - Travellers
The prayer and the supplication of the Prophet (ﷺ) at night
Ibn `Abbas reported: I slept (one night) in the house of Maimuna, the wife of the Messenger of Allah (ﷺ), and the Messenger of Allah (ﷺ) was with her that night. He (after sleeping for half of the night got up and) then performed ablution and then stood up and observed prayer. I too stood on his left side. He took hold of me and made me stand on his right side. He (the Prophet) observed thirteen rak`ahs on that night. The Messenger of Allah (ﷺ) then slept and snored and it was a habit with him to snore while sleeping. The Mu'adhdhin then came to him (to inform him about the prayer). He then went out and observed prayer without performing ablution. (`Amr said: Bukair b. Ashajj had narrated it to me )