I have had chicks that chirp unusually loud, and some that absolutely scream especially by themselves. This chick, ALWAYS the same one will be asleep with it's 2 brothers and 1 sister. All of a sudden it's like a siren goes off and it wakes up chirping it's head off. 4 successive chirps. Then it calms down. Is it even possible for a bird to have a nightmare? And why on earth is it happening every hour?!