the best prayer after the fardhi is the night prayer, i.e. the tahajjud
and the closet encounter we with Allah is when we postrate to Him, i.e. sujud
as for each living soul, the face are the most honorable part compare to other body parts,
and to lower our face to postrate to Him, indicates we have indeed lower ourselves to glorify Him upmost.
For this, it is encourage to supplicate to Him during our sujud. The longer the better..inshaAllah
