Hmmm, well, I usually don't operate off much sleep... the only time I get a good 8 hours sleep is during the holidays... This isn't because Engineering is the hardest tertiary course, I'm sure Bcom is quite venomous but probably studying Actuarial Science is one of the most difficult, but reasons for my poor sleep is because Engineering entails a lot more work (lot's of subjects, and most consume a lot of time with Tuts and labs ). So get home at 5, eat supper, then start to do essays (I do a full year of English this year lol, and essays take time ), preparing for labs, studying, homework etc.