If I'm not mistaken there is no factual link between DMT and dreaming. It is found in trace amounts in your body but it has never gone past being just a theory Rick Strassman has about it. Sleep deprivation is more like deliriants such as Datura, Diphenyldramine, Amanita Muscaria, ect. You see small things out of the corner of your eyes like small bugs, inanimate objects appear to move ever so slightly when there just about out of your peripheral vision, and eventually silhouettes of people on the walls (If you wait long enough they'll eventually start talking to you... "telepathically"
). An if you achieve it on amphetamines than you will most likely be thinking that the things you are seeing are being secretly projected into your mind by a government mind control operation to stop you from masturbating (i.e. SEVERE paranoia and possible amphetamine psychosis; paranoid psychosis + hallucinating delirium = psychotic breakdown). I'm guessing the same effects would occur with caffeine. Please no one try this, if you must experience the feeling of being completely insane use some Diphenyldramine it is probably less physically harmful on your body...