system
A chat on 4chan
human
SPEAK, FIGHT, OR RUN

>if it's a paranormal entity who stumbled in, nothing says it is inherently seeking to harm you. It may not know or care that it broke into your home
Speak in a calm polite voice while looking for an exit/weapon. You only have about 2 seconds. Read it's responses, try to assess its hostility, and assume nothing. Statistically speaking, you are most likely prey, who is just buying time Look for an exit. 'Hello (friendly tone.) My name is [made up name, don't say your real name.] May I ask who you are?' (Reaching for nearest window, or a baseball bat)
>it's mostly a gaunt, fleshy thing. Nothing about it looks strong or invincible, yet.
A quick strike to the head with something hard, or sharp, could do the trick, but its still a risk. It's legs look thin and weak.
Grab a lamp or your trusty crowbar, and back toward an exit. Get ready to charge past it and defend yourself if there's no window
>RUN
If you can't tell if it's hostile and you can't possibly take it on, you have no choice but to somehow get it behind you. Lure it in just a little and get ready to dodge past at the LAST second, and move slowly until you're ready.
gpt
Logically speaking, always have multiple exits and weapon stashes in your room planned out. Treat this like you would any other home break in. 
If you've done your homework, you should be an arms reach away from some kind of weapon when you wake up. 
(For me its a metal bat hidden under my bed)
Your goal is to escape your house unharmed. If you have a family emergency plan, be sure to gather together at your focus point and call the authorities. If you are confronted with a direct threat of physical violence (i.e the creature blocks your escape and brandishes its teeth) use physical force.

If it is of a incorporeal nature, discovering its weakness may be another matter entirely. Direct engagement is not recommended, do not acknowledge it's presence unless you recognize its form.