It was narrated that 'Aishah said:
"If the Prophet (ﷺ)" - (one of the narrators) 'Amr said: "If the Messenger of Allah (ﷺ)" - "wanted to eat or sleep while he was Junub, he would perform Wudu'." In his narration, 'Amr (one of the narrators) added: "Wudu' was for prayer." (ES)
English reference (ES): Vol. 1, Book 1, Hadith 256 (ES)
Arabic reference (ES): Book 1, Hadith 257 (ES)