I often hear and read about how some parrot owners can't sleep in on the week-end because their birds will make enough noise for them to get up.
I guess I'm part of the few exceptions, as my birds will rarely make any noise until they hear one of us make noise first - in which case, they'll then venture a few whistles so we know they are awake too.
I am not knocking this; in fact, I'm quite happy they are this way. I do cover their cages at night, although for some people I don't think this makes any difference. But I am happy that I get to decide if I let them out at 7am or 9am.