What is the difference between sleeping and coma?

What is the difference between sleeping and coma?

As far as coma is concerned, that also can be induced by various things but it's a disorganized state as far as the brain is concerned. Various parts have shut down which wouldn't normally won't be down, others are still working. Whereas, with sleep, the sleep systems have organized some parts to shut down, others in fact to keep on working. So if I use dreaming sleep as an example, with dreaming sleep when you're aware of dreams, that's part of the brain that's still working as if it were awake but it's not connected to the outside world.