So here's the issue. Classes start at 3PM and end at 8PM. That means I'm on campus late, eat dinner there, and need a pick-me-up at dinner to make it through my harder courses that occur at the end of the day. Normally, coffee is the go-to, but it's too late in the day - meaning I'm unintentionally up way past when I need to sleep. Thus, I'm looking for suggestions that are just as effective without the caffeine, if possible. Any specific teas, perhaps?
You could try eating a low carb/low glycemic index dinner. Your body's insulin level spiking after you eat can lead to you feeling more sleepy and foggy-headed.
You might try Gyokuro green tea, or maybe Matcha. It's got a different mix of caffeine and L-theanine, and might keep you up less. It still messes with my sleep, though.
Don't underestimate the value of drinking enough fluids in general. Being well hydrated can make a big difference in wakefulness and concentration.