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
This hadith has been transmitted with the same chain of transmitters from Mu'awyia b. Salih by Zuhair b. Harb, 'Abd al-Rahman b. Mahdi, Harun b. Sa'id al-'Aili and Ibn Wahb.