Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:9023 – Hannād b. al-Sarī > Abū al-Aḥwaṣ > Manṣūr > Sālim > ʿAlī > Idhā Ajnab al-a man Faʾarād

[Machine] If he wants to sleep or eat, then he should perform ablution, his ablution being for prayer.  

الكبرى للنسائي:٩٠٢٣ – أَخْبَرَنَا هَنَّادُ بْنُ السَّرِيِّ عَنْ أَبِي الْأَحْوَصِ عَنْ مَنْصُورٍ عَنْ سَالِمٍ عَنْ عَلِيٍّ قَالَ «§إِذَا أَجْنَبَ الرَّجُلُ فَأَرَادَ

أَنْ يَنَامَ أَوْ يَطْعَمَ فَلْيَتَوَضَّأْ وُضُوءَهُ لِلصَّلَاةِ»  

See similar narrations below:

Collected by Suyūṭī
suyuti:1162a –

when the prophet ﷺ intended to sleep while he was sexually defiled, he would perform ablution as he did for prayer. (Using translation from Abū Dāʾūd 222)   

السيوطي:١١٦٢a –

"إذَا أراد أحدُكم أن ينامَ وهو جُنُبٌ فليتوضأ وضوءَه للصّلاةِ".  

[حم] أحمد عن عائشة