Modafenil
The movie limitless was based on it (Modafinil). Can confirm that my own research you definetly won’t sleep and be laser focused. However, the way down is not fun. Much like an amphetamine withdrawal.
For example, a caffeine crash X 1000. I’ve never experimented with Meth but I’ve had black market high powered pre-workouts that will make you want to kill people. Adderal has the same effects.
Looking back you must be familiar with some substance to have 36 posts in this bread.