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.
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.