Narrated `Abdullah bin `Amr bin Al-`As:
Allah's Messenger (ﷺ) told me, "The most beloved prayer to Allah is that of David and the most beloved fasts to Allah are those of David. He used to sleep for half of the night and then pray for one third of the night and again sleep for its sixth part and used to fast on alternate days."
Sahih al-Bukhari 1131
----------------------------
Narrated Ibn `Abbas:
The prayer of the Prophet (ﷺ) used to be of thirteen rak`at, i.e. of the night prayer.
Sahih al-Bukhari 1138
-----------------------------------
Narrated Anas bin Malik
Once the Prophet (p.b.u.h) entered the Mosque and saw a rope hanging in between its two pillars. He said, "What is this rope?" The people said, "This rope is for Zainab who, when she feels tired, holds it (to keep standing for the prayer.)" The Prophet (ﷺ) said, "Don't use it. Remove the rope. You should pray as long as you feel active, and when you get tired, sit down."
-----------------------------------
Narrated 'Abdullah bin 'Amr:
Once Allah's Messenger (ﷺ) said to me, "I have been informed that you offer Salat (prayer) all the night and observe Saum (fast) during the day." I said, "(Yes) I do so." He said, "If you do so, your eye sight will become weak and you will become weak. No doubt, your body has right on you, and your family has right on you, so observe Saum (for some days) and do not observe it (for some days), offer Salat (for sometime) and then sleep."