ٱللَّهُ ٱلَّذِى جَعَلَ لَكُمُ ٱلَّيْلَ لِتَسْكُنُوا۟ فِيهِ وَٱلنَّهَارَ مُبْصِرًا ۚ إِنَّ ٱللَّهَ لَذُو فَضْلٍ عَلَى ٱلنَّاسِ وَلَـٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يَشْكُرُونَ Qur’an Ghafir (40:61)Allahu allathee jaAAala lakumu allayla litaskunoo feehi waalnnahara mubsiran inna Allaha lathoo fadlin AAala alnnasi walakinna akthara alnnasi la yashkuroona
See note [77] on 27:86 .
The succession of Day and Night in our physical life is frequently appealed to, as a symbol to draw our attention to the Mercy and Bounty of Allah. If we viewed these things aright, we should serve Allah and seek Light from Him and Rest from Him, and celebrate His praises with gratitude.