Suprabhatam means awaking the god during the early morning time by praising the almighty.
Among the Suprabhatam, Venkatesha Suprabhatam is very famous. And the short form of the Suprabhatam is:
O!the great Lord Venkateswara, the noble son of Vakula Devi! The Sandhya of the East commences. O! Best of men (Purushottama)! Please wake up, since the divine daily rituals have to be performed.
Let us sing this song regularly during the early morning time, in order to get the grace of Lord Venkateswara.