If their activity cannot be attributed to being hungry, they may be thinking that it's spring already. You may be able to breed them now, without brumating them. If it was me, I'd put them together and see if they are interested. If so, that's why they were so active. If not, then wait a while and introduce them again or go ahead and brumate them.
As I just implied, they don't have to be brumated to breed, though some people have said that brumation increases fertility, though some have also said that they never brumate yet still get great fertility rates.
If you still want to brumate them, give them their last meal at least 2 weeks, preferably 3 weeks, before you lower temperatures. Then try to lower the temperature to around 60 F. I brumate mine in my basement which ranges from 55-65 F. Continue to give them water while during brumation, but don't feed them. The main concerns with brumating are 1.) that you gave them enough time to get all food waste out of their bodies and 2.) that the temperatures are low enough so that they don't loose too much weight. Above all, make sure they are healthy before brumating them, you don't want to exacerbate a health problem, like a respiratory infection for example.
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