Literally pathetic. Unhealthy, unnecessary, and you seem overly addicted.
No offence.
I'm no health guru, I've drank more aspartame in my life than 50% of this planet put together, but you're doing feeding an addiction. You don't need caffeine to get through a ****ing lecture.
Start exercising and if you need something to stay awake then get something cold. Lemon water, tea or eventually even pepsi (as its cheaper than coffee) and two or three ice cubes and that's all you need. But you shouldn't need that in the first place unless you're like 45 and need to stay on life support to open your eyes in the morning.