Allah Most High says:

"And He is who has made night for you a concealing raiment, and sleep a lull in oblivious peace*, and made day a restoral to life"

[Sura al-Furqan 25:47].

"And [We] made your sleep a lull in oblivious peace*; And made the night a covering raiment; And the day a livelihood"

[Sura al-Naba 78:9-11].

"And of His truly wondrous signs is your sleeping by night and day and your eager seeking in them of His bounty: Verily in that are a multitude of mighty signs for a people who hear"

[Sura Rum 30:23].

*The phrase "a lull in oblivious peace" suggests that during sleep, one experiences a temporary pause or break from the awareness of the world around them. It implies a state of tranquility or serenity where the individual is unaware of their surroundings, concerns, or anxieties, hence the term "oblivious peace." This phrase underscores the idea that sleep provides a respite from the stresses and distractions of waking life, allowing the mind and body to rest and rejuvenate in a state of peaceful unawareness.

It was narrated by Abdullah bin Amr bin Al-`As that the Messenger of Allah ﷺ said:

"O `Abdullah! Have I not been formed that you fast all the day and stand in prayer all night?" I said, "Yes indeed, O Messenger of Allah ﷺ." He said ﷺ, "Do not do that! Observe the fast sometimes and also don't fast sometimes; stand up for the prayer at night and also sleep at night. Because your body has a right over you, your eyes have a right over you, and your wife has a right over you."

[Sahih al-Bukhari 5199].

In the above Hadith, the Prophet Muhammad ﷺ characterizes sleep as a fundamental right of the body. Neglecting this need is likened to committing oppression (dhulm) against oneself. Our mortal frames, that we so dearly identify with, are in fact not even ours. They are a temporary loan which Allah Most High has so generously lent us in this life. Our ultimate self is the self that will exist into the next life--the eternal life--long after our physical bodies have decayed. Simply put, we are souls with bodies, not bodies with souls.