I have noticed before when we have had long stretches of subzero weather and i put a heat lamp in to keep water thawed that the chickens start laying again. I am not a huge fan of having eggs in winter though, because while I am at work the eggs have frozen and my last flock developed an egg eating habit from the cracked eggs. Also, i agree probably best to give my ladies a rest. This year I installed a cozy coop radiant heater to avoid my birds having to sleep with a light on all night and to help protect my japanese roo's huge comb. I keep chickens primarily as pets and for their beauty. I like getting eggs, but we get way too many for our use. My family is too far away to give eggs and I don't have many neighbors. I better whisper it, but I get really sick of eating and collecting eggs sometimes. I do freeze them, give some to the dog/chickens, pickle them, scramble them, omlet them, angel food cake them, lemon curd them, cookie them, cake them, make deer spray with them...haha you get the idea. Geesh, I just hate to waste things so I always use them up, but it's a challenge.