I can honestly say in VCE that my sleeping pattern was shocking towards the end. However, I remember talking to this one guy before uni who always seemed to have a spring in his step. He said he ALWAYS slept before 12am, no matter what. Plus he had a pretty darn good diet.
So I applied his strategy in Semester 1, and for the first 5 or so weeks of uni I slept before 12am everyday, not like 11:59pm, but usually 10:30pm-11:00pm. I can honestly say I curbed my coffee habit quickly and just felt so alive. Although it seems difficult and your life seems busy, it's doable
I know a guy who did a degree and majored in Biology and Psychology while being a football player in uni, managing a relationship and being a bodybuilder. He still got those 8-9 hours. I guess it's about a lot of discipline.