This thread has been quite an interesting read. It's really making me think about my bird's sleep schedule. Since I've gotten Poppy, I've followed that regurgitated advice: 12 hours of uninterrupted sleep. She gets covered sometime between 10-10:30pm, and I get her in the morning between 10-11am depending on how late I sleep. I can tell she definitely isn't sleeping the whole time, but I thought that this schedule at least gives her the opportunity to sleep as much as she needs to. She's usually been up, chattering and eating for a while before I get her.
Lately, I've been experimenting with a sleep cage in our bedroom vs her main one in the living room to see what works best for her. On one hand, she seems to prefer getting to hear our voices in the same room, but it also seems to distract her; after her initial few screechy protests, she calms down but stays up quite late grumbling, almost in annoyance ("why aren't you guys going to bed too??"). With her cage in the living room, she throws a much louder tantrum at bedtime. I can hear her first few loud screeches fade into a few minutes of heartbreaking little cries before she finally begins to settle down.
This was a long way to say that I'm not sure what is best. There's so much we don't know about these complex little beings, and it makes it so frustrating when you're trying to do everything right but nobody even knows for sure what those right things are!
I guess all we can do is keep researching, observing their behavior, listening to their communications, and trying our best.