Last fall, I opened up my deck umbrella to air it out before winter-storing it
in the garage. Within the folds, there were tons of these new alien brown sting-bugs.
Being still early in a (chilly) morning, I quickly half-filled a cup with water added
some detergent (they drown in it) and scoped them all up.
Some of them do find a way to make it inside the (warm) house.
I have seen a few of them 'lousy' fliers by my night lamp.
So far no six-footed bomb has landed on my face or my wife's yet (eeek!).
Also, I have seen some (spring) squirming baby-ones, ~1/16" by
a window. They look exactly as the adults. They then later (starved) died
- mama figured a way in, but could not figure a way-out of the house!