I have mates that stay up till 6 on their xbox and get up at 8, I'm the total other end of the spectrum. Bed between 11-1 usually and up about 7-8. So average about 8 hours sleep?
This will sound crazy but like 3-4 hours in the week and sleep like crazy on the weekends unless I go to the track on Sunday.
I believe my mind is hyperactive because I find it really hard to get to sleep. When I lay down my mind starts going crazy about previous situations and whether I did the right thing etc...