I agree, I have a hard time with it as well. However, I have noticed that if I force myself to workout a few times a week and get in a routine then I sleep better so maybe 10PM to 5AM is achievable...I just need to get back into that routine. :) But I think a lot factors in such as stress, sleeping comfortably, sleeping enough but not too much, etc.

Considering he has a 4 day work week, I imagine he gets a little more sleep Friday-Sunday to make up for it.

that may be because you actually oversleep. unless you're very young (<20yo), 7h of sleep is likely all you need, and anything less than 6h or more than 8h will leave you tired and lacking energy.