Yeah, my beardie is just starting to brumate. I don't mess with his lights or anything, but naturally the house is getting a little cooler, and the days are much shorter, so he knows. My mali uromastyx however (and adopted uro that was neglected...I call her a "special needs" lizard because she has some strange habits) is showing no signs of slowing. She's eating as much as usual, basking as much as usual (which really is only a few hours a day anyways), and just as fat as usual.
This year I have to remember to try to get my beardie to poop before he goes all of the way down in brumation. Last year he didn't, so about a month or so later...well...it wasn't pretty..it wasn't pretty at all.
Brumation is sort of the depressing part of the year, and for me, still sort of the scary part (it's harder to tell how bad or good the lizard is doing), but you have to let nature take its course.