In a perfect world, we'd all sleep better, but as a father of 3 with a full time job, I understand that the world isn't perfect. Use good judgement, and try to manage time better, but I can totally relate. When I was in college, I don't think I was getting more than 5 hours of sleep a night.
I find when most people say this, they aren't being honest with themselves. Not saying that is your case, as you are obviously running around, but for a college student it actually pays more to cut out 2-3 hours of studying and get the sleep. When I started spending less time studying by going to bed earlier and making 1-2 hours a day for the gym, my grades actually rocketed in college. For reference, I graduated with high honors in Computer Engineering after starting out my first 2 quarters with a 2.6 GPA.
If you are being honest with yourself, and you really CAN'T get that much sleep, then there is no substitute. You need to suck it up, and fight through it, as most hard times in life. Taking caffeine pills, drinking coffee, etc. will help as short term solutions for the tired feeling, but the benefits of sleep will still elude you until you make time in your lifestyle for sleep.
Getting more than 8 hours of sleep IS an option for 99% of the population, people just put other shit on top of their list aside from sleep - like spending time on an online forum or playing video games or training parkour, for example. Sleep is a fundamental need for survival, and to put that below anything on your list (barring anything like children) for an extended period of time is a folly, in my opinion.