سُبْحَانَ ٱللَّٰهِ
Holy Qur'an
Al-Qur'an
Kids Qur'an
It is not necessary to understand this for any particular canonical prayers. It is good to spend a part of the night in prayer and praise: Cf. lxxiii. 6. And the Dawn is a daily recurring miracle, full of spiritual influences and "testimony": Cf. xvii. 78-79.
Idbar-un-nujum: the setting of the stars: the glorious hour of early dawn. In cxiii. 1, we seek Allah's protection as "Lord of the Dawn".