I experimented with the Uberman sleep schedule myself as a student (i.e. 2 hours sleep a day, split into 20 minute naps). I stuck rigidly to the schedule over the course of three weeks but despite near-perfect discipline, it only got harder and harder.

The hours between 1am to 5am were the hardest. I would stay awake because the program required it (and supposedly it gets easier as your body 'adjusts') but between these hours I was totally useless. I couldn't read because my eyes would unfocus, I had blackouts where I couldn't remember anything. Usually I would just sit and stare catatonically at a wall.

I started breaking things and falling over due to malcoordination from the sleep deprivation and finally gave up after spending a night hallucinating that strange figures were appearing out of the wood patterns on my desk.

I slept for 24 hours and felt like a completely different person after I woke up.

So I encourage you to actually try this yourself, and see if it works. Just don't drive, operate heavy machinery or in fact do anything remotely risky during the experiment. Sleep deprivation can be dangerous.

Personally, I think the 2 hours is enough theory is garbage.

That sounds like one of those excuses people make for something that doesn't really work.