وَمِن رَحمَتِهِ جَعَلَ لَكُمُ اللَّيلَ وَالنَّهارَ لِتَسكُنوا فيهِ وَلِتَبتَغوا مِن فَضلِهِ وَلَعَلَّكُم تَشكُرونَ

Out of His mercy, He made for you the night and the day, so you may rest therein, seek His bounty, and perhaps express gratitude.