Chapter: It is permissible for one who is junub to sleep, but it is recommended for him to perform wudu’, and wash his private parts if he wants to eat, drink, sleep, or have intercourse
Ibn Umar reported: Umar b. al-Khattab said to the Messenger of Allah ( صلی اللہ علیہ وسلم ), that he became Junbi during the night. The Messenger of Allah ( صلی اللہ علیہ وسلم ) said to him: Perform ablution, wash your sexual organ and then go to sleep.
Authentic