What did the Prophet Muhammad (peace be upon him) advise to do when praying during the night?
 Narrated Ibn `Umar:                     A man came to the Prophet while he was delivering the sermon and asked him how to offer the night prayers. The Prophet replied, 'Pray two rak`at at a time and then two and then two and so on and if you are afraid of dawn (the approach of the time of the Fajr prayer) pray one rak`a and that will be the with for all the rak`at which you have prayed." Narrated 'Ubaidullah bin `Abdullah bin `Umar: A man called the Prophet while he was in the mosque.