When the Prophet (May peace be upon him) wanted to eat or sleep, he would perform ablution. She meant that (the prophet did so) when he was sexually defiled.  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا أَرَادَ أَنْ يَأْكُلَ أَوْ يَنَامَ تَوَضَّأَ تَعْنِي وَهُوَ جُنُبٌ  

The Prophet ﷺ granted permission to a person who was sexually defiled to eat or drink or sleep after performing ablution. Abu Dawud said: In the chain of this tradition there is a narrator between Yahya b. Ya'mur and 'Ammar b. Yasir. 'Ali b. Abi Talib, Ibn 'Umar and 'Abd Allah b. 'Amr said: When a person is sexually defiled wants to eat, he should perform ablution.  

أَنَّ النَّبِيَّ ﷺ رَخَّصَ لِلْجُنُبِ إِذَا أَكَلَ أَوْ شَرِبَ أَوْ نَامَ أَنْ يَتَوَضَّأَ