If you are impure before going to sleep, perform wudu

Hadith 

You can sleep in impure body, but perform wudu

 

"حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا هِشَامٌ، وَشَيْبَانُ، عَنْ يَحْيَى، عَنْ أَبِي سَلَمَةَ، قَالَ سَأَلْتُ عَائِشَةَ أَكَانَ النَّبِيُّ صلى الله عليه وسلم يَرْقُدُ وَهْوَ جُنُبٌ قَالَتْ نَعَمْ وَيَتَوَضَّأُ‏.‏" 

  

Narrated Abu Salama: 

I asked `Aisha "Did the Prophet (ﷺ) use to sleep while he was Junub?" She replied, "Yes, but he used to perform ablution (before going to bed). 

Sahih 

Sahih al-Bukhari, 286

In-Book Reference: Book 5, Hadith 38

USC-MSA web (English) reference: Vol. 1, Book 5, Hadith 284 (deprecated numbering scheme) 

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