Musnad Abu Ya'la al-Mawsili 150:225

'Abd al-A'la narrated to us, Waki' ibn al-Jarrah narrated to us, from Sufyan, from Abu Ishaq, from al-Aswad, from 'Aishah, she said: The Messenger of Allah (peace and blessings of Allah be upon him) would sleep while in a state of major ritual impurity (junub), just as he was, without touching water.