He used to become sexually impure at night, then he would want to sleep. The Messenger of Allah told him to perform ablution and then go to sleep.
Sunan Ibn Majah Book 1, Hadith 320
← Previous Hadith 'Umar bin Khattab said to the Messenger of Allah: "can anyone of us sleep if he is sexually impure?" He said: "Yes, if he performs ablution."

Sunan Ibn Majah Book 1, Hadith 319 Next Hadith → "The Messenger of Allah said: 'If anyone of you has intercourse with his wife, then he wants to do it again, let him perform ablution.'"

Sunan Ibn Majah Book 1, Hadith 321