Quran - Surah 39, Verse 42
"It is Allah that takes the soul (of men) at death; And those that die not (He takes) during their sleep: those on whom He has passed the decree of death, He keeps back (from returning to life), but the rest He sends (to their bodies) for a term appointed. Verily in this are signs for those who reflect"
What is sleep? As far as human life is concerned, it is the cessation of the working of the nervous system. Yet, other human functions, such as digestion, growth, and the circulation of blood, continue, possibly at a different pace. The mental processes are also suspended in sleep except those that deal with recollections, which are present vividly in our subconscious.
But there are other kinds of dreams in which the dreamer sees things as they actually happen, backwards or forwards in time, or in which gifted individuals see spiritual truths otherwise invisible to them. How can we explain this? It is stated in the above verse that our souls go to a plane of spiritual existence analogous to physical death. In poetic imagery, "Sleep is the twin brother of Death."
During sleep or "minideath", our souls are, for a period of time, released from the bondage of flesh. Allah reclaims them during this time. If, as some do, we are to die peacefully in sleep, our souls do not come back to the physical body that, then, decays and dies. If our time to die has not yet dawned allowing us to fulfill our lives according to God's Will, our souls return to our bodies, and we resume our functions in life.
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