The Apostle (ﷺ) woke up at night; relieved himself, and then washed his face and hands and then again slept.
Sahih Muslim Book 3, Hadith 20
← Previous Hadith We sent al-Miqdad b. al-Aswad to the Messenger of Allah (ﷺ) to ask him what must be done about prostatic fluid which flows from (the private part of) a person. The Messenger of Allah (ﷺ) said: Perform ablution and wash your sexual organ.

Sahih Muslim Book 3, Hadith 19 Next Hadith → Whenever the Messenger of Allah (ﷺ) intended to sleep after having sexual intercourse, he performed ablution as for the prayer before going to sleep.

Sahih Muslim Book 3, Hadith 21