When you wake up after a good night of sleep, and you feel groggy and incapable of performing even the simplest tasks for a few moments, that is sleep inertia. Normally, sleep inertia isn't a problem, we get over it and drag ourselves out of bed. However, in the military, sleep inertia can be a problem if there's an emergency and troops need to be ready immediately.

Most people, when woken up suddenly by such a situation, won't experience much sleep inertia at all, since adrenaline quickly kicks in. However, those who are affected by sleep inertia despite that can lag a military unit behind. This can be quite a problem.

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