I live on the Jersey Shore and this is right around the time that ladybugs hibernate for the season. They like the south side of houses or buildings or even trees. And they hibernate in large numbers.
I know my fear is mostly irrational. Years ago (around 18) when we were still looking at houses to buy, our realtor took us to this house that had been unoccupied for quite a long time and was in a large, mostly wooded lot. The house was set up really strangely ... I don't remember there being any real hallways, you had to go through other rooms (even bedrooms) to get to the next room. I remember all the doors being closed for whatever reason, except this one door that led into the living room (on the south side of the house). I don't know why, but I pulled the door away from the wall and screeched .... no exaggeration, thousands upon thousands (probably more) of ladybugs were all along the walls, in the crevices between the ceiling and the wall in the ceiling cove and halfway up the ceiling. Totally freaked me out. We had already decided against it for several reasons, but that was the game changer. I remember trying to look it up, but this was before wiki and all that stuff so I didn't get very far. A few years ago, I did read up on it though when I noticed several ladybugs flittering around my windows and outside doors, which is how I got the info in the first paragraph.
So it's again their time for hibernation. I have seen, no lie, like two dozen ladybugs at a time buzzing outside this one window (of course, on the south side of the house) where I spend a lot of time reading or watching TV. I've seen them buzzing around our front and back doors too, and the other day I noticed that there were three ladybugs on that same window INSIDE the house. We've always had a few buzzing around during hibernation time, but NEVER in the numbers I've seen this year. We have dogs so we do open the doors more often than most, but I'm kind of freaking. The numbers of them buzzing around the window (these are new windows and there's NO WAY they're getting in through there or any of the other windows) has increased to several dozen at a time. And the three ladybugs have since vanished (the resident bug killer was at work). I keep having nightmares that I'm going to wake up and find that whole wall (which is a huge wall, the entire width of our house with only that window as an obtrusion) covered in ladybugs. I'm afraid they've found some way into the house other than the window. Has anybody else seen so many of them? I get they're relatively harmless, but could you imagine thousands of these things waking up in the spring IN YOUR HOUSE???