The word(s) "sleep" appears 16 time(s) in 15 verse(s) in Quran in Mohsin Khan translation.

(1) Allah! La ilaha illa Huwa (none has the right to be worshipped but He), Al-Hayyul-Qayyum (the Ever Living, the One Who sustains and protects all that exists). Neither slumber nor sleep overtakes Him. To Him belongs whatever is in the heavens and whatever is on the earth. Who is he that can intercede with Him except with His Permission? He knows what happens to them (His creatures) in this world, and what will happen to them in the Hereafter. And they will never compass anything of His Knowledge except that which He wills. His Kursi extends over the heavens and the earth, and He feels no fatigue in guarding and preserving them. And He is the Most High, the Most Great. [This Verse 2:255 is called Ayat-ul-Kursi ]

(2) It is He Who takes your souls by night (when you are asleep), and has knowledge of all that you have done by day, then He raises (wakes) you up again that a term appointed (your life period) be fulfilled, then (in the end) unto Him will be your return. Then He will inform you of that which you used to do.

(3) Did the people of the towns then feel secure against the coming of Our punishment by night while they were asleep?

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

(5) 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.

(6) And you would have thought them awake, whereas they were asleep. And We turned them on their right and on their left sides, and their dog stretching forth his two forelegs at the entrance [of the Cave or in the space near to the entrance of the Cave (as a guard at the gate)]. Had you looked at them, you would certainly have turned back from them in flight, and would certainly have been filled with awe of them.

(7) 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.

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

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

(10) 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 Gracious (Allah) had promised, and the Messengers spoke truth!"