Translation of the verse 9 from Surah An-Naba’ : Number of verses 40 - - page 582 - Part 30.
And have made your sleep as a thing for rest.
And made your sleep [a means for] rest
(78:9) and made your sleep a means of repose, *7
*7) The explanation of the wisdom for which Allah Almighty has placed a desire for sleep in man's nature in order to make him fit for work in the world, and which impels him to a few hours' sleep after every few hours of work, has been given in E.N. 33 of Surah Ar-Rum.
Source : An-Naba’ Verse 9: And made your sleep [a means for] rest