>>12399707The sleep schedule Tesla employed was natural. It was possible for him due to the aforementioned genetical mutation (normal people can't sleep below 4.5h). Many older people still sleep segmented (before electricity it was common for monks to go to sleep, wake up and pray in the darkness, and go to sleep again), siesta is common in Hispanophone and Asia, &c. Artists (musicians, painters, mathematicians, or whatever) naturally sleep in such a way as to maximize REM.
Regarding the 10min deviation, you are sleep deprived. Humans naturally become tired a few minutes before the time their bodies are aligned to, and wake up again around the same time every day. Oversleeps smaller than 30min are only concerning if they occur outside of the sleep blocks (humans naturally sleep longer when they are ill for obvious reasons).
By the way, you are also in the higher risk group for cancer, cardiovascular diseases, and so on. All of it comes from scientific journals, the polyphasic community's experiments mostly center around the impact of different substances on sleep quality, or the long-term consequences of extreme schedule (for example, the inventor of Uberman as well as a number of experienced users, helped to establish the changes in taste preferences, or increased need for eating)
