Masruq is reported to have asked ‘Aisha about the action (most pleasing to) the Messenger of Allah (may peace be upon him). She said: He (the Holy Prophet) loved (that action) which one keeps on doing regularly. I said (to ‘Aisha): When did he pray (at night)? She replied: When he heard the cock crow, he got up and observed prayer.
Chapter : Permissibility of observing Nafl (voluntary prayer) standing or sitting and observing some part of it standing or sitting.