Because in my never-ending quest for eggs I bought 3 girls to add - 18 week old RIR pullets today - and put them in a separate cage. I notice mine are all in bed at 3:30 - 4 and the new RIRs are still out in their run. So I kicked all my girls out and shut their coop door. All the bantams have pretty much stayed lined up at the door, but my Red Sex-linked are happily freeranging still at 5 pm and just about dusk. Normally they would have been in bed too with the bantams. When I saw the behavior of the new RIRs, I started to wonder if maybe my girls are going to bed too early.....maybe that's why my RSL have not laid an egg yet at 24.5 weeks. The bantams (silkie, cochin, and sebright) are around the same age as the RSL (24 weeks or so) except for 1 cochin who is 1 1/2 years....not an egg from any of them! (The adult cochin moved to my house this fall - 6 weeks ago or so....was laying at the old place but not for me). What do you think? Could they not be getting enough afternoon light? What time do everyone else's chickens go to bed?