This summer we have had 2 or 3 every week, flapping in the house at nightfall.
At dusk we have a small *flock* every evening. I’m grateful they are eating the mosquitoes which have been terrible this year.
I don’t know how the little browns are getting in, but they do. We have a routine for catching them. Lucky I kept the butterfly nets my grand daughter used. :)
Just scoop up and out the door you go...
Only twice over three decades here. The last one was too smart for a net, much less a confined room during the day.