"Going off lay"

Egg production has really dropped with the changing of the seasons, we are getting one every other day or so. We think this is Leia and the other two have given up. This might have been a matter of concern for us (given that this is our first winter with the chickens) but today, Jill Archer put my mind at rest by referring to the fact that her hens were "going off lay". I am now completely reassured, safe and sure in the knowledge that if it was on 'The Archers', it must be legit. The chooks are going to bed at 16.15 now! Have added some worming powder to their layer pellets as it has been a while.