[oxide]

you still get psychosis after not sleeping for a few days, just like with amphetamine IIRC.

the brain needs sleep, we aren't sure why, but stimulant psychosis does a pretty good job of proving that you start to break down after depriving yourself of sleep. paranoia, hallucinations, etc are all very common with this kind of stimulant abuse where you're keeping your body awake for days at a time.

generally speaking, if you use stimulants (or "wakefulness promoting agents" like modafinil) regularly you should be dosing first thing in the morning after feeding yourself, not re-dosing, eating what you can when you can and sleeping each night as much as possible.