There are different levels of sleep and unconsciousness.
If you think of the brain as an engine, and going 100% is being awake and going 0% is dead. Awake is 100%, Dreaming is 80%, really deep sleep is about 50-60 (but can get as low as 40), general anaesthesia is generally between 40-60 (so really deep asleep). A coma patient on the other hand is idling at a mere 30-40% or maybe even lower.
The difference between a coma due to injury and a medical induced coma is that there is nothing wrong with the medically induced coma patient (or rather there shouldn’t be anything wrong). As soon as you stop those drugs throttling down the brain a medical induced coma patients brain should be revving right up.
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