Do they not have an outside run/coop?Yep. I'm keeping them in the house today since I've got three 'sickies', and she's been doing it a lot I've noticed. It's like she's majorly tired and just can't keep her eyes open. It's so weird, I wish I knew what was wrong. I put the probiotics in the water for now.
At 4 months old, they all need to be outside - she may be dosing off because of lack of stimulation, sunshine, space, etc.