How old are your babies?

With my adults I do pretty much what Light of Dae suggested. I just pretty much leave them alone, remove any light or heat source, but I don't cover the tank or go out of my way to make it any darker or colder than normal. They're between my kitchen & dining room, so get a fair amount of light & activity, but it doesn't seem to matter. Once I know they've skipped a few meals I go to only offering food once a week and sometimes every 2 weeks once it's established that they just aren't going to eat... and I do waste a fair amount of food this way, but the snakes seem fine, which is the important part. I've had my oldest snake for 10 and a half years and he does this every year.

With babies I try much harder to keep them up & active. I give them a heat lamp and try to replicate longer/warmer days to try and keep their appetite going through winter. This has seemed to work with babies. They might slow down, but don't go completely off food. If they do go completely off food a short brumation is probably in order as they can deplete their stores much quicker than adults.

I have no experience with brumation/hibernation at all and everyone here is happy & healthy