i always thought that chickens can't see red light and keeping them under a red heat lamp would not interfere with their sleep pattern, but how wrong could i be. i moved all my chicks out into the shed with their red heat lamp took all the food away at night as they will be a sleep. but i kept going out and they were running around and peeping. so i removed the red lamp and put out my ceramic heat light and they instantly went to sleep, not a peep out of them until first light when they were ready for their food. so lesson learnt no more red light for my chicks.