I loved this article too.
Especially this: "If you have been tip-toeing around at night or depriving yourself of trips to the refrigerator in fear of waking your parrot, you can stop that right now. Obviously, parrots have evolved systems for incorporating interruptions like that into their ability to get adequate rest"
Sometimes my t.v. stays on til very late at night, and sometimes it is on very early in the morning, (like now). I honestly believe this does not bother mine at all. Once they get used to this, I think it must be like someone getting used to sleeping with white noise, or in an apartment housed on a busy street, etc.
I have a friend who debates with me on sleep cycles. I try to not get my days and nights turned around for practical purposes, but also for my birds. I do believe they do better with somewhat of a schedule, ie: sleeping at dark time, waking in light times.