Deep sleep also exists in the waking state. We are always in deep sleep. That should be consciously understood and realized. There is really no going or coming from it. Becoming aware of the deep sleep state while in the waking state is samadhi. It is nature, i.e. prarabdha (that part of karma being worked out in this life), which forces you to emerge from it. Your ego is not dead and will rise again and again.
