Here is a link to a really good study on fatigue when riding a motorcycle long distances rapidly. Now before you say "so what" it is by Vice Admiral Don Arthur, former Surgeon General of the United States Navy. This is likley the best real world written study on the topic I have EVER seen. For Spec Ops, and the average war fighter this little PDF should be MANDATORY reading. Yeah, it's about motorcycles, but it applies to everybody.
ETA: Don't put those motorcyclists off. They are experts at fatigue management as a group.
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