Hmm..
Pepper goes to sleep around at the earliest 9:30pm, and the latest 10 - 11pm..but most times not that late because I, myself am always tired LOL
and on weekdays usually I'll get her up between 630isham - 8am depends.
Normally she doesnt make a sound in her cage, unless she is up and doesnt wanna be in there anymore. Every morning I take her out she usually stretches then goes "WOO" and steps up! =) lol
So I guess she doesn't get the full sleep, but it doesn't seem to affect her mood at all. She takes naps during the days....and yea!