What's up, brain-havers!? Feeling a little less-than-fresh? Maybe a slight headache? Something not quite right up in the dome? Well, you could be dehydrated. That's probably it. Did you drink any water today? You know I told you you should drink more water! Are you getting enough sleep? Sometimes when I can't sleep it's because I didn't get enough exercise that day. It could be that. You know what my mom's friend Sheila does? She just goes for a 15-minute power walk around the block on her morning break. Everyone can find 15 minutes, you know. That's what Dr. Oz says. No? You don't think that's it? Well, I guess you could have a GIANT SACK OF MONSTER TEETH GROWING INSIDE YOUR BRAIN AND CHEWING ON YOUR MEMORIES.
(Oh, or it could be brain maggots. Always good to cover all your bases.)