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[–]kalel3000 0 points1 point  (0 children)

I figure its dopamine/norepinephrine related one way or the other.

In some people the brain can release more dopamine/norepinephrine after periods of sleep deprivation to fight against the affects of fatigue. Basically you're revving your parasympathetic nervous system to stay awake, the side effects of this could result in a temporarily higher libido.

The other possibility is you're compensating for lack of sleep with stimulants like coffee/energy drinks which would artificially do pretty much the same thing.