In the first three days at the morning service, instead of “God is the Lord”..., “Alleluia” is sung, and then the troparion:
Behold, the Bridegroom comes at midnight, and blessed is the servant, whom the vigilant will find: but he is not worthy, but the despondent will find him. Take care, my soul, not to be burdened with sleep, lest you be given over to death, and the kingdom shut up outside: but arise, calling: Holy, holy, holy art thou, O God, have mercy on us through the Mother of God.
Behold, at midnight, comes the Bridegroom; and blessed is that servant whom He finds watching; but he is unworthy (of the kingdom) whom He finds asleep. My soul! Be careful not to be burdened with (spiritual) sleep, so as not to die a (sinful) death and remain outside the doors of the kingdom of heaven; but cast off your slumber, crying out: holy, holy, holy, O God, through the intercession of the Mother of God, have mercy on us.