I stop feeding two weeks before brumation.

I just put them in my basement with no lights, a hide, and a water dish. My basement runs 60 degrees, while the main part of the house is 68, and the office where my PC monitor and reptile lights heat the room up, is usually 70 - 75... and of course warmer in the basking areas.

I cover the tanks in the basement with a sheet for continual darkness.

The drop from the 70 - 75 degree room to the 60 degree basement is sufficient to put my snakes into a light brumation. I keep them down there for six weeks, and bring them back up. I time the brumation so they go to sleep in early to mid January and wake in the first week of March.