I know cockatiels get to a level of decibels of 85. My parents are worried about the cockatiel screaming during the night when we're trying to sleep or when someone's working. So, do cockatiels scream during nighttime? I was sure they didn't because surely, in a pitch black closet they'd be so tired from a twelve hour day they'd sleep just like humans do. So how often does your cockatiel scream both at day and night? Can you hear them throughout the house?