This is kind of funny (not like ha ha funny, rather cool/odd, funny) My chickens, broody or not..though they DO poop during the night, the majority of my hens let loose a very large poop as soon as I let them out in the morning. I would say 2/3 size of a broody poop, but not as stinky. Most (not all!) night time poops under the roosts are much smaller. It's almost like they hold onto the 2nd half of the night's worth of poop to let it loose outside?? (It is much more true this time of year, a bit less so in the winter...?maybe because the nights are so long then?)