I have, at long last, come to the conclusion that I really need to do more about doing a proper recovery regimen after rides. I often have headaches (similar to a hang-over headache) after standing up and general exhaustion after longer rides (35+ mi) that continue for most of the day.
I try to prepare well, and stay fairly well hydrated on the ride. I typically go through close to if not over 2 bottles in a 30-40mi ride. Usually go out with 1 bottle cytomax, 1 bottle water, or both cytomax. As well as additional gels for longer rides.
Post ride right now, I usually just have a half bottle of cytomax to make sure I have some sugars and electrolytes going in after the ride is over. The headaches make me think I'm still low on hydration and/or electrolytes, but as much liquids as I'm taking in I'm surprised my body is requiring even more.