Judge? Jury? Yeah, I'll execute
A person who is ready to perform a theft is going to spot the house and ensure nobody is in it before entering. A person who enters a house when people are sleeping is usually armed, and there for possible confrontation during a theft. These are not good people, and I for one don't want taxpayers to pay 50 grand per year in jail because I was soft. Also, in the US a person could potentially sue you if you injured them seriously and they got out of the house, then it's your word against theirs. I don't really see that I need an actual judge or jury to see whether someone actually comitted a crime when they are in my house while I am sleeping, I know they are trying to do it, and if I let them get away with it they will do it again. Plus, a bad person that gets hit in the head with an iron bar may just come back and kill you when he heels up, not a good prospect in the long run. I am not trying to act like a macho asshole, I don't really want to put a hole in my wall (I hate sheetrock) and go through counseling because I took a life. (I may not need it, I won't know unless it happens) Just realize that if I have the option to protect myself, I will at all costs, even if it means taking a life to save my own. Hope this is not too "Yankee" sounding, and that you can see a bit of logic in it.
P.S. I would rather the person just left immediatly when met by my dogs, that would keep me from even knowing if it was a person or a moose. Then I can go back to sleep..