i have 6 issa browns in sydney australia. i usually get 4 eggs a day. last night they went to bed around 6 when it got dark as normal. they seemed fine. about 8 i heard 1 of them clucking heaps and went out to see and 1 of them is out and walking around. i didnt know why so i just put it back in its house. it kept clucking for a while and setled after a while. this morning i noticed it an egg right where it was clucking, that wasnt there the night before. could it have layed an egg at night? do they do that sometimes?