Hadith.179 - Ubaydullah ibn Ali Al-Halabi said: ‘Imam Jafar ibn Muhammad Al-Sadiq عليه السلام was asked whether it is appropriate for a man to sleep while in a state of janabah (ritual impurity from sexual discharge).’ Imam عليه السلام replied: 'It is disliked (makruh) to do so without first performing wudu (ablution).'