I used amphetamine in binges on and off and I've recently realised that all it gives me is weakness and I don't need it at all. I used it mostly when I was around people to be talkative. I usually talk about abstract stuff that nobody is interested in because they don't understand it, so I often used stimulants/empathogens to be more like the others. It's useless to be honest and once you free yourself from the compulsion, you can clearly see that your reasons for taking amphetamine/other stimulants have no basis.
I often stay awake at night even without stimulants because I work best when it's calm and quiet around me. And with amphetamine sometimes I would be awake for a week already seeing stuff that was not there and I would tell myself "just one more line, I know I need to sleep, but I don't want to yet". This is crazy when you think about it, it's nothing more but your body wanting more dopamine that is even not there any more. So if you're thinking that you should stop, then you're right, most of the time there is no good reason to exhaust yourself.