Narrated Um-Salama: (the mother of the believers) Um Sulaim, the wife of Abu Talha, came to Allah's Apostle and said, O Allah's Apostle! Verily Allah is not shy of (telling you) the truth. Is it necessary for a woman to take a bath after she has a wet dream (nocturnal sexual discharge)? Allah's Apostle replied, Yes, if she notices a discharge.