Effects - Speed when tired.

[kerang]

Swim started working night shift this week and since he slept very little this weekend he was really tired. He thought it would be a good idea to take a small amount of meth to just elevate his energy up a notch, but not so much that he got high.

At swims work theres plenty heavy machinery moving around and high tempo, so he need to be "on top of his game". He is not very experienced with strong stimulants.

So he did the minimum amount he knew he get effect from, an hour before work and as usual he did it orally. About the time he clocked in at work he felt some of the effects he knew before, elevated heartbeat, mouth drynes, armpit perspiration and penis shrinking.

But he could not really say he felt more energized or alert even if he do so usually at those doses.
He wonders if this is because of his sleepless weekend, which in part was due to speeding(Saturday night to ~Sunday noon)

Like he said he is not so experienced and he is a bit worried to end up with dialated pupils if he up's the doses.

So his question is, will someone who is very tired react differtly to stimulants than he would, was he rested?