﴿ وَٱلَّذِينَ يَبِيتُونَ لِرَبِّهِمْ سُجَّدًۭا وَقِيَٰمًۭا ﴾

“and who remember their Sustainer far into the night, prostrating themselves and standing;”

and who spend the night before their Lord prostrating sujjad is the plural of sājid and standing in worship in other words they spend the night performing prayers;