Though I suppose I'm a nontrad, I'm young for this forum. I was wondering whether you older and more experienced folks could give me some advice about maintaining concentration throughout long days. For the first time in my life I'm getting up consistently early - around 6 am most days - and commuting to school, rather than rolling out of bed ten minutes before class and walking cross campus, and then working a night job. I find that I'm tired by 12 pm, very tired by 4pm, and exhausted by 8:30. And yet I also find I need to be studying or otherwise usefully occupied until ten or eleven each night.
For the first time in my life I'm consuming large quantities of caffeine to get by, and I'm not too happy about this new habit/dependence. I'm sure at some point this will be "normal" for me, but I'm still adjusting psychologically to not being an on campus student, not having campus life at my fingertips, but instead being a commuter student, a nontraditional student, etc.
TL;DR: what are some tips for focusing and working efficiently when you're tired? caffeine alternatives?