A couple of our ducks have been acting like they want to sit (I think), so I have been letting them amass eggs. The problem is that they appear to be sitting on them at night, but not during the day. I assume that is going to cause a problem, right? The eggs will get warmed up at night to start developing and then chill during the day. So, should I go back to taking the eggs for a while yet and see if they become more resolute?