my pair have a room of there , it truly has Improved there temperament. I think all who suggested this . for about a year now I notice night time noises , after some investigation while I suspect it’s her and not him I can’t confirm . it’s always low volume but is noises they make . How much at a given time is usually one noise and that’s it , but it is a few times a night . Happens after a few hours of roosting . It’s not noises they make if scared or fighting with each other. It’s like a low muttering . they do this in both homes too. I am at times a very light sleeper I hear noises I think most would not. I have had birds who mutter while going to sleep , but not once a sleep. the noises are done while there heads are reversed . What I have seen and they do this during the while they are taking a nap. but there heads are not reversed , sorry if there is a name for this please post it. I have 3 vets and no one says it’s an issue but no one acts like they have had birds that do it late at night. There room here in New York has no windows and a door . Down south it’s a gated place so no trucks or ghetto blaster cars. any ideas or do I let it be.