Mukhtasar Bukhari

Narrated Abdullah bin Amr bin Al-As (may Allah be pleased with him): The Messenger of Allah (peace and blessings of Allah be upon him) said to him: "The prayer most beloved to Allah is the prayer of Dawud (David), and the fasting most beloved to Allah is the fasting of Dawud. He would sleep half the night, pray for one third of it, and then sleep for one sixth of it. And he would fast one day and not fast the next day."

Umm al-Mu'minin Aisha Siddiqa (may Allah be pleased with her) said: The deed which could be done consistently was beloved to the Messenger of Allah (peace and blessings be upon him). The narrator says: I asked, "At what time would the Messenger of Allah (peace be upon him) get up (at night)?" She said: He would get up when he heard the crowing of the rooster.

In one narration, (Ash'ath says) that when the Prophet (peace be upon him) heard the crowing of a rooster, he would get up to perform the Tahajjud prayer.

Umm al-Mu’minin Aisha Siddiqa (may Allah be pleased with her) says in another narration that I found the Prophet Muhammad (peace be upon him) sleeping beside me in the last part of the night.