How do you get out of a coma?

Yes, many people have recovered from a coma.

it is someone who is on a life support machine due to the fact that they can't breathe on their own. which is also a state and often prolonged unconsciousness; usually the result of disease or injury.

In many cases, from a severe head injury but there are many other causes for comas. Also comas can be caused from lack of oxygen to the brain such as if one was to fall unconcious underwater they may...

You stop dreaming I would imagine.

coma that occurs with advanced hepatic insufficiency and portal-systemic shunts, caused by elevated blood ammonia levels; characteristic findings include asterixis in the precoma stage and paroxysms...