(19) باب النُّعَاسِ فِي الصَّلاَةِ
Narrated Abu Hurairah:
The Messenger of Allah (ﷺ) as saying: When one of you gets up by night (to pray), and falters in reciting the Qur'an (due to sleep), and he does not understand what he utters, he should sleep.
Reference: Sunan Abi Dawud 1311
In-book reference: Book 5, Hadith 62
English translation: Book 5, Hadith 1306