Why Am I So Effing Tired?

When coffee lets you down, where do you turn?

The past few weeks, coffee hasn’t been cutting it in the name of energy and focus. It’s irritating to say the least.

I drink my water, I get my rest (mostly), and I exercise. I spend time outside, I read, and even take my vitamin D supplements.

So? What gives? Why the sluggish, zombie-like feeling?