(An-Naml) 27 : 86
أَلَمْ يَرَوْا أَنَّا جَعَلْنَا اللَّيْلَ لِيَسْكُنُوا فِيهِ وَالنَّهَارَ مُبْصِرًا ۚ إِنَّ فِي ذَٰلِكَ لَآيَاتٍ لِقَوْمٍ يُؤْمِنُونَ
Didn’t they observe that We made the night for resting in peace and the day giving Insight? Indeed in that are signs for a believing people.
See explanation 3: 190-191; 17: 12-15 and 25: 62.