Hadith 893
Abu Hurairah reported the Messenger of Allah ﷺ as saying; when you come to pray while we are prostrating ourselves, you must prostrate yourselves, and do not reckon it anything (rak’ah) he has been present at the prayer.
Hadith 1263
Narrated Aishah, Ummul Muminin: 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.