It is narrated from Hazrat Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) used to come to the house of Hazrat Umm Sulaym (may Allah be pleased with her) and sleep on her bed, and she would not be there. One day, as usual, the Prophet (peace and blessings be upon him) came and slept on her bed. She came home and saw that the Prophet (peace and blessings be upon him) was drenched in sweat. She absorbed that sweat with cotton and squeezed it into a bottle, and mixed it with her perfume.