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@Arducius
And here's something that might interest (or bore) some of you. On saturday's long run my running buddy was struggling toward the end*, but to be fair this was her longest ever run and she picked a route that was all up and down... Anyway at the end she was saying she felt really sleepy/groggy. It only occurred the following morning that his was because she had exhausted her glycogen supply in the leg muscles, and started relying on the liver's store of glycogen which is normally reserved for the brain and spinal cord to handle nervous system functions. Less energy for the brain = feeling sleepy.
Biology in action!
*To her credit she was still running at target pace at the end despite admitting she would have bailed earlier if she's been on her own.