﴿ وَمِنَ ٱلَّيْلِ فَٱسْجُدْ لَهُۥ وَسَبِّحْهُ لَيْلًۭا طَوِيلًا ﴾

“and during some of the night, and prostrate thyself before Him, and extol His limitless glory throughout the long night.”

(And worship Him (a portion) of the night) pray the prayer of Maghrib and 'Isha'. (And glorify Him through the livelong night) pray to Him at night, this refers to supererogatory prayers; it is also said that the night prayer was made compulsory on him but not on his Companions.