When I was ill, off school for a week a while ago (hear me out, I can picture it so vividly but can't explain it to save my life) the first night of being ill, I was talking on msn and felt so bad all of a sudden that I lay on my bed for a while, then came back to the computer but my head starting hurting and my eyes when I moved them. I lay in bed watching a film with Arnold Schwarzenegger as a fireman in it. Well the film had finished and I was feeling awful so I tried to go to sleep, my God it was like I'd just swum in a pool of acid and absorbed millions of hits, I was lying there with my eyes closed and all I could see was a dark, desolate city, like flying around on a helicopter through the buildings and all the while more skyscrapers were shooting up out of the ground.
It sounds shitty, but it was so intense and not being able to get to sleep, and then it happened when I opened my eyes, like all noises in my head and stuff.
I must have been asleep at one point 'cause I couldn't stop all the images around me.
Ok, so that doesn't make it sound as intense as it was, but it's the first time something like that had happened to me and I didn't know what the fuck had happened.
I may have been "feverish" but I don't think it'd make you trip out and be dreaming all the fucked up stuff I was which I couldn't stop.

In conclusion, if you start feeling very ill one night, don't go to sleep, or you'll trip like a bitch.

It was a free high, sort of, but IMO not worth it.