At the old house we had a cat get in through an open window with embarrassing results. With this fresh in my mind, I only open the high windows on the first floor. We’ve had other “visitors” in this house. In the middle of the night a month ago H jumped out of bed after being stung by a bee that flew in our window. Last Saturday morning as I was looking forward to a good sleep in because of the jet lag, I was awoken abruptly with a shake and the words “there’s a bird in the house”. I never got out of bed to see it, H guided it back outside through the bathroom window, I just did my best to go back to sleep.
I haven’t done any research but I imagine having a bird in the house is either really good luck or a sign of pending doom.