(53) بَابُ الْوُضُوءِ مِنَ النَّوْمِ وَمَنْ لَمْ يَرَ مِنَ النَّعْسَةِ وَالنَّعْسَتَيْنِ أَوِ الْخَفْقَةِ وُضُوءًا
Narrated Anas:
The Prophet (ﷺ) said, "If anyone of you feels drowsy while praying, he should sleep till he understands what he is saying (reciting). (PT)
Reference (PT): Sahih al-Bukhari 213 (PT)
In-book reference (PT): Book 4, Hadith 79 (PT)
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 4, Hadith 212 (PT)