He (the Prophet (p.b.u.h) ) used to get up for the prayer on hearing the crowing of a cock.
Sahih al-Bukhari Book 19, Hadith 13
← Previous Hadith I asked `Aisha which deed was most loved by the Prophet. She said, "A deed done continuously." I further asked, "When did he used to get up (in the night for the prayer)." She said, "He used to get up on hearing the crowing of a cock."

Sahih al-Bukhari Book 19, Hadith 12 Next Hadith → In my house he (Prophet (p.b.u.h) ) never passed the last hours of the night but sleeping.

Sahih al-Bukhari Book 19, Hadith 14