["I keep hearing noises out my window and I'm home alone. It's very concerning.", 'Should you call the police or something?  I hate being home alone for this exact reason.', "I don't know, it's just scratching so maybe it's just a raccoon."]
Or a cat maybe?  Maybe you should look into installing those motion flood lights or something so that you feel safer when you are home alone.
I keep hearing noises outside my window. It sounds like scratching.