Hibernation as animals do it is not really in the cards. Humans don’t do that.
A medically-induced coma is easy, but it also offers no advantages over being awake, but instead it really accelerates muscle and bone loss, something that’s already a big issue in zero gravity.
Freezing and rethawing without killing the person is very, very far from being viable. It’s actually quite far from a concept of a plan right now. We have no idea how (or even if) we could do this.
Depends on what you mean.