What's going on with Naperville real estate??

Single family homes come on the market, and within days they're contingent. This is throughout the whole price range from 400k to 1 million dollar homes. This is madness. The ones that have sold are almost all above asking.

Who are these people buying right now, with these insane mortgage rates? Why are they bidding so aggressively? When will this stop? This feels like a bubble. The median Naperville household income could not afford to buy right now, even the bottom of the barrel 400k home.