"And by the night and what it gathers," meaning: what it collects from the deeds of creation, whether good or evil.
﴿وَاللَّيْل وَمَا وسق﴾ وَمَا جَمَعَ مِمَّا عَمِلَ فِيهِ الْخَلْقُ مِنْ خَيْرٍ أَوْ شَرٍّ