Sunan Abi Dawud Book 5, Hadith 13
When the Messenger of Allah (ﷺ) finished his prayer late in the night, he would see. If I was awake, he would talk to me. If I was sleeping, he would awaken me, and pray two rak'ahs, then he would lie down as long as the mu'adhdhin came to him and call him for the dawn prayer. Then he would pray two rak'ahs lightly and come out for prayer.
The Prophet (ﷺ) said: If any of you prays two rak'ahs before the dawn prayer, he should lie at his right side.
Marwan ibn al-Hakam said to him: Is it not enough that one of us walks to the mosque until he lies at his right side? According to the version of Ubaydullah, he (AbuHurayrah) replied: No.
This statement (of AbuHurayrah) reached Ibn Umar. He said: AbuHurayrah exceed limits on himself. He was asked: Do you look askance at what he says? He replied: No, but he dared and we showed cowardice. This (criticism of Ibn Umar) reached AbuHurayrah. He said: What is my sin if I remembered and they forgot?
When the Prophet (ﷺ) prayed the two rak'ahs of the dawn prayer, he would lie down if I was asleep; in case I was awake, he would talk to me.