It was narrated that Abu Qatadah said:
"They told the Prophet (ﷺ) that they had slept and missed the prayer. He said: 'There is no negligence when one sleeps, rather negligence is when one is awake. If any one of you forgets a prayer or sleeps and misses it, let him pray it when he remembers it.'" (ID)
English reference (ID): Vol. 1, Book 6, Hadith 616 (ID)
Arabic reference (ID): Book 6, Hadith 622 (ID)