Allah reminds His servants of His favors towards them by subjugating for them the night and day, without which they could not survive. He explains that if He made the night continuous, lasting until the Day of Resurrection, that would be harmful for them and would cause boredom and stress. So He says:

meaning, “with which you could see things and which would bring you relief?'

{Will you not then hear?} Then Allah tells us that if He had made the day continuous, lasting until the Day of Resurrection, that would also be harmful for them and their bodies would get tired from so much movement and activity. Allah says:

meaning, 'to rest from your work and activity.'

{Will you not then see? It is out of His mercy} towards you,

He created both,

{that you may rest therein} during the night,

during the day, by traveling, moving about and working.

So that you may give thanks to Allah by performing all kinds of acts of worship at night and during the day. Whoever misses something during the night can make it up during the day, and vice versa. This is like the Ayah,

{And He it is Who has put the night and the day in succession, for such who desires to remember or desires to show his gratitude.} (25:62).

And there are many similar Ayat