http://amp.weforum.org/agenda/2017/04/not-sleeping-gene-mutation-california-research
I always wondered how many business leaders get away with sleeping 4-5 hours a day (Marisa Meyer, Jack Dorsey, Donald Trump...).
According to science this may likely be the effect of a genetic mutation only 1% of the population has, which means that these people then have 20% more time at their disposal than us normal folks.
Personally I need at least 8 hours of sleep to feel completely fine - most often even 9 hours.