Volume 1, Book 4, Number 140 :
Narrated by Kuraib
Ibn 'Abbas said, "The Prophet slept till he snored and then
prayed (or probably lay till his breath sounds were heard
and then got up and prayed)." Ibn 'Abbas added: "I stayed
overnight in the house of my aunt, Maimuna, the Prophet
slept for a part of the night, (See Fateh-al-Bari page 249,
Vol. 1), and late in the night, he got up and performed
ablution from a hanging water skin, a light (perfect)
ablution and stood up for the prayer. I, too, performed a
similar ablution, then I went and stood on his left. He
drew me to his right and prayed as much as Allah wished,
and again lay and slept till his breath sounds were heard.
Later on the Mua'dhdhin (callmaker for the prayer) came
to him and informed him that it was time for Prayer. The
Prophet went with him for the prayer without performing
a new ablution." (Sufyan said to 'Amr that some people
said, "The eyes of Allah's Apostle sleep but his heart does
not sleep." 'Amr replied, "I heard 'Ubaid bin 'Umar saying
that the dreams of Prophets were Divine Inspiration, and
then he recited the verse: 'I (Abraham) see in a dream, (O
my son) that I offer you in sacrifice (to Allah)." (37.102)
(See Hadith No. 183)