Dawn would never find him with me except asleep, meaning the Prophet ﷺ.
حدثنا أبو توبة عن إبراهيم بن سعد عن أبيه عن أبي سلمة
ما ألفاه السحر عندي إلا نائما تعني النبي ﷺ
Bukhari, Tahajjud, chapter on one who sleeps at dawn, no. 1133, from the hadith of Ibrahim bin Saad, and Muslim, Prayer of the Traveler, chapter on the night prayer and the number of units the Prophet ﷺ performed at night, no. 742, from the hadith of Saad bin Ibrahim, through him.