Hair Cut

Finally got a hair cut. Walked over 13 miles yesterday in minus 20 c with the wind chill. Today have been up since 0500 but having great difficulty in generating much enthusiasm for the work. Big contrast with yesterday when I was raring to go. Trying to understand the reason for this difference. Possible answers include:
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Glycogen Hypothesis

In the attempt to understand my sleep and fatigue problems, I have been reviewing the available scientific literature. Years ago, when I engaged in aerobic running, it was understood that fatigue was a consequence of the build up of lactic acid in the muscle and the depletion of muscle glycogen. This resulted in the sense of fatigue.
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