[cryptonector]

It depends as much on weather as on forage availability. If there's no nectar flow during the winter, then they'll just not spend so much effort on foraging, maybe? I'm not sure. Where I am it's hot much of the year, but winters are not a walk in the park for the bees, so they definitely hibernate. (They don't sleep all winter, just they don't go out on cold days, but since it's Texas there are sufficiently warm winter days they will go out on those days, mainly to poop.)