If I have things to do, then sleep is for the weak! But I eventually go to sleep when my eyes won't stay open. I have a rule of at least trying to get 3-4 hours of sleep so If I need to wake up at 6 and I'm trying to finish up something for the next day then I stay up until around 2-3 am max. Because with too little sleep I can't function anyways. At school we'd actually joke about our lack of sleep. We'd pretend that we had no idea what sleep was. We'd go: slee what? Oh! you mean falling unconscious/coma!