A chicken has not set sleep pattern. Chickens will fall asleep on and off throughout the day. Chickens will sleep laying down and when standing. This is true for chickens at all stages in their life cycle.
No, rats cannot sleep standing up. The only mammals that can sleep standing up are large herbivorous mammals, like horses. They sleep standing up because it is sometimes difficult for them to stand up for lying down. Some birds, like flamingoes, sleep standing on one foot.
They sleep standing up. They can be kept in a barn at night with hay to eat and water to drink and will sleep standing up in their stall. they sleep standing up on the ground, in a paddock or barn, free of charge unless your agisting