When you are asleep, so is the physical component of your self. The five senses, smelling, tasting, feeling, seeing, and hearing, and your ego, the controlling master, are all temporarily suspended from activity.
Sleeping allows the other sense that you have, the sixth sense, to take over for awhile with out much interference. This is when both the physical body and your spiritual essence can perform maintenance simultaneously to help unwrinkle parts of your life.
Its ironic that this is the state of being that psychics and mediums practice for years to achieve, and everyone enters it every time they fall asleep.
Read : There are several components to each dream category:
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