Egg Production Way Down

I've gotten no eggs for six days now! I actually had to buy 1/2 dozen eggs at the grocery store! Not only do I have 2 hens that are broody but for some reason, my two Polish Crested aren't laying either. I wonder if it's the cold? I just don't know. I miss the fresh eggs. Update: December 2 - Here is an excellant article I found regarding reduction in egg production. http://extension.oregonstate.edu/catalog/html/pnw/pnw565/