What happens then is up to a jury. If they believe that you reasonably believed your life was in danger, they should not convict. You're absolutely right about getting awakened (or at least if you sleep like I do). It would take me five minutes to get coherent enough to probably think completely rationally and that should be taken into consideration. I know this may not be answering your question, but there's no "rule" that says what happens under those circumstances. You have a right to protect yourself and your family. If it's reasonable to think that you need to employ deadly force, then hopefully the jury would acquit. In a situation where someone was literally sitting and waiting for someone to come in and then start blasting without even seeing a weapon, then maybe the result is different. But the jury is supposed to employ a "reasonable person" standard when deciding whether it was a justified shooting or a criminal act.