"Rasulullah Sallallhu 'Alayhi Wasallam did not perform more than eleven rak'ahs during Ramadhaan or after Ramadhaan. (Eight rak'ahs tahajjud and three rak'ahs witr). He performed four rak'ahs. Do not ask of its length or how wonderfully (i.e. with humbleness and concentration) it was performed. In the same manner he performed four more rak'ahs. In the same manner he again performed four rak'ahs, and do not ask of its length or how wonderfully it was performed. After that he performed three rakahs witr". Aayesha Radiyallahu 'Anha says "I said: "O Messenger of Allah. Do you sleep before you perform witr?" He replied: "O Aayesha, my eyes sleep, but my heart remains awake". (This is a special gift to the ambiyah (prophets) that their hearts remain awake at all times)