What do you do if someone breaks into your house at night whale you are sleeping

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So lets say you are sleeping and you don't have a security system and someone breaks a window in another room and comes into your house. Should you turn on the light and call the police but if you do that they might come into your room and if they had a gun they could shoot you. Should you go around your house and check? What should you do? This should be a very interesting discussion lol, but seriously, what do you do?