Umar asked the Prophet "Can anyone of us sleep while he is Junub?" He replied. "Yes. if he performs
Sahih Bukhari - Bathing (Ghusl)
Written by infinitelight.org   
Tuesday, 21 February 2006
Narrated 'Abdullah: 'Umar asked the Prophet "Can anyone of us sleep while he is Junub?" He replied. "Yes. if he performs ablution." Volume 1. Book 5. Number 287