Mine like to sleep outside in the attached run when it's hot in the summer. I have thing's out there for them to roost on too and it's predator secure, so I let them roost where they feel the most comfortable at.Yeah, I have come to believe that cooling their coop at night is the biggest help. I believe...perhaps incorrectly...that a part of the build up that causes heat stroke is the chemical build up in their bodies caused by the constant panting. It seemed like having them sleep comfortably really decreased their stress during the day (which of course makes complete logical sense!)