Coma has body functions still working, so blood pumping, ceels dying and regenerating, which means if you had cancer it would grow, if you had kidney failure, your blood cleanup would fail. Only thing AFAIK medically induced coma does is help with anything that the brain might be doing to itself like swelling or other complications.
Hibernation supposedly would slow down all metabolical functions, so less to no, blood flow and so on.
English is technically my fourth language and I started learning it at age 12. However I really got good around age 16 when I started watching a lot of Hollywood movies with subtitles. Even now when I speak fluent English, with dare I say some "elegance", i prefer my movies with subtitles, because it's just a happy place in my mind.