Therefore We covered up their (sense of) hearing (causing them, to go in deep sleep) in the Cave for a number of years.

Then We raised them up (from their sleep), that We might test which of the two parties was best at calculating the time period that they had tarried.

Likewise, We awakened them (from their long deep sleep) that they might question one another. A speaker from among them said: "How long have you stayed (here)?" They said: "We have stayed (perhaps) a day or part of a day." They said: "Your Lord (Alone) knows best how long you have stayed (here). So send one of you with this silver coin of yours to the town, and let him find out which is the good lawful food, and bring some of that to you. And let him be careful and let no man know of you.

And it is He Who makes the night a covering for you, and the sleep (as) repose, and makes the day Nushur (i.e. getting up and going about here and there for daily work, etc. after one's sleep at night or like resurrection after one's death).

And among His Signs is the sleep that you take by night and by day, and your seeking of His Bounty. Verily, in that are indeed signs for a people who listen.

They will say: "Woe to us! Who has raised us up from our place of sleep." (It will be said to them): "This is what the Most Beneficent (Allah) had promised, and the Messengers spoke truth!"

It is Allah Who takes away the souls at the time of their death, and those that die not during their sleep. He keeps those (souls) for which He has ordained death and sends the rest for a term appointed. Verily, in this are signs for a people who think deeply.

They used to sleep but little by night [invoking their Lord (Allah) and praying, with fear and hope].

So wait patiently (O Muhammad ﷺ) for the Decision of your Lord, for verily, you are under Our Eyes, and glorify the Praises of your Lord when you get up from sleep.

And have made your sleep as a thing for rest.