Harun bin 'Antra هارون بن عنترة بن عبد الرحمن الشيباني · The Book of the Times (of Prayer)

"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.'"