[bshimmin]

I thought this too, I won't deny it. I suppose two counterpoints would be:

1) If you really can work days and days on end without feeling tired or feeling the need for sleep (as someone who works very, very excessive hours, I can safely say I spend most of that time yearning for my bed), in all likelihood you are going to come crashing down at some point;

2) You can definitely start hallucinating purely from lack of sleep, after "only" a couple of days, without the assistance of any hallucinogenic drugs.