I wouldn't by any means consider my first attempt at adapting to the Uberman a failure. I learned so much and had the most amazing personal experience. Rather than causing me to become disparaged with the whole process, the first attempt actually galvanized my resolve for the second attempt, which would ultimately prove successful.
I had read quite a few conflicting articles and blogs about the adaptation process, and at the time I couldn't understand why there was so much conflicting opinion about which the most difficult days were during the adaptation phase. Some (indeed the vast majority) said that it was during days six, seven and eight, with day nine heralding the end of the bouts of narcolepsy. But a notable minority said that in fact those days were not so bad, and that days 10, 11, 12 and 13 were the killers. Needless to say, I assumed that when someone adapted to a schedule such as this, the process would be a carbon copy each time. As I was to find out, this is not the case. It seems that the adaption process is not only unique to each person, but also seemingly unique to each attempt.
Even though the process of adaptation was noticeably different the second time around, it was obvious to me just how useful it is to have previous experience of sleep deprivation and the Uberman in general. I took many lessons learned "the hard way", as they say, from the last attempt.
Due to the normal rigors of life I was not able to start my second Uberman attempt directly after my first attempt. In hindsight it was probably a good thing to have some time off between attempts, as it gave me time to reset my system. I have heard a few people say that you should take at least six months between attempts, so that you have a chance to get back to a normal routine, before you try to change things around again. While I can see the logic in not simply diving into the next attempt within, say, a week of the last one, I don't know exactly why six months should be used as a delimiter. No reason has ever been given, as far as I can find. Perhaps unchallenged assumptions such as these simply permeate the bloggosphere until someone asks "why?".