forgo daily

So today I took a caffeine pill (200 mg) to see if it’ll help me stay awake, and the little god damn pill made me sleepier! I know too much caffeine can actually make you sleepy among other things, but that was all I took! It’s supposed to be equivalent to two cups of coffee. This happened two times (the only two times I’ve taken a caffeine pill) and it doesn’t happen when I drink lots of caffeine in beverages… why? Not like I’ll need it anymore though, seeing how I’m out of school for good