Can we offer the two supererogatory Rak`ahs of Fajr after sunrise or before Fajr Prayer?

Question 4: If a person sleeps until sunrise, should he pray the two supererogatory Rak`ahs (units of Prayer) before offering the Fajr (Dawn) Prayer?

Answer: If one is overpowered by sleep and could not wake up until after sunrise, he should perform Fajr (Dawn) Prayer when he wakes up and should offer the Sunnah (supererogatory) Salaah before Fajr. It is authentically reported that the Messenger of Allaah… read more here.