Also you wife comes in "estrus" every month and not once a year.
That is faulty logic. Poultry cycle daily when the daylight hours are right, hence why chickens and turkeys lay one egg a day. It all has to do with hormones levels produced during the night that rid the bird of anestrus (lack of cyclicity) and start it cycling.
My guess is that with the warm temperatures and lack of cloud cover, the daylight hours needed were realized earlier, hence why a slight adjustment in nesting has been noticed.
Thats just my 2cents and my attempt to scientifically explain whats going on out there.