How did Prophet Muhammad (saw) perform ablution in the middle of the night?
 Narrated Ibn `Abbas:                     That once he stayed overnight in the house of his aunt, the wife of the Prophet. He added: I lay on the cushion transversely while Allah's Apostle lay along with his wife in the lengthwise direction of cushion. Allah's Apostle slept till the middle of the night, either a bit before or a bit after it, and then woke up rubbing the traces of sleep off his face with his hands, and then recited the last ten Verses of Suratal-`Imran. Then he got up and went to a hanging water skin, performed ablution from it ---- and performed it perfectly. Then he stood up to perform the prayer. I also did the same as he had done and then went to stand beside him. Allah's Apostle put his right hand on my head and held and twisted my right ear. He then offered two rak`at, then two rak`at then two rak`at, then two then two rak`at, then two rak`at, and finally, one rak`a witr. Then lay down again till the Muadhdhin (i.e. the call-maker) came to him, whereupon he got up and offered a light two rak`at prayer and went out (to the Mosque) and offered the (compulsory congregational) Fajr prayer.