Chickens are now laying..are yours?

I know that Spring is somewhere around the corner here but the temps are still freezing and in the 20/30's. I am surprised that 4 of my hens have been laying eggs everyday for the past week! They stopped laying entirely around November. I thought they were on winter break..lol. They're currently on a scratch feed but if they are going to start their laying cycle now (is daylight really longer now?), then I will change them back to a laying pellet. What are your hens doing in the laying department now with natural daylight?
Trish