Dormancy isn't a 'switch' as such. Over winter they may not grow at all, or grow slowly when the temperatures allow. Even if they experience warmth for a couple of weeks, the photoperiod will indicate the time of year and new growth consists of large leaves and little traps anyway.
One of my plants even caught and digested a slug during December, so dormancy doesn't mean they're out for the count. Root growth also continues during dormancy.