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.'" (DE)
English reference (DE): Vol. 1, Book 6, Hadith 616 (DE)
Arabic reference (DE): Book 6, Hadith 622 (DE)