When I left "da troof" about 11 years ago, I went through a phase where I was really curious about drugs. One of the best drugs I tried was amphetamine. Unfortunately, I'm not the kind of person who can control drug use sensibly, so now I stay well away from most drugs. But I remember the "pain" of needing sleep real bad after about 3 days but not being able to sleep. My field of vision was broken down into seperate components so objects in the room would "break off" and float around as their own entity (in my head). The come down was real bad. It's not a good feeling when you need three nights sleep all at once but your heart is racing and certain parts of your mind working over-time.