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A coma is a state like a deep sleep when the anatomic functions like breathing, digestion, eliminating wastes, maintenance of a normal blood pressure and the alike continue but the patient has no awareness and no control over any of the bodily organs or functions. It is like a prolonged deep sleep and there is no guarantee when the person, if ever would come out of it naturally.
Hibernation too is a long sleep but the difference between a coma and hibernation is that animals which hibernate can come out of it naturally when the external environment is favorable. Also during hibernation there are changes in the animal’s body with body temperature dropping to very low levels, breathing and the heart rate slowing down and most other anatomic functions coming close to a stop.
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