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I've made two suggestions then that are not contradictory.

Okay but this guy is saying that he purposely sleeps 11 hours a day so that he can be more creative and cognitively enhanced and I'm the one being questioned for sources lol.

You seem to have implied sleeping long offers productivity. Might it be the case others are equally productive at the recommended 8 hours? Might it be the case that you need two hours extra sleep per night to get where everyone else is cognitively with eight hours sleep? Because if that is the case then you are losing time, productive time, and may in fact be losing some of your life, depending on how one views it. You may be sleeping away 8.33% of your life needlessly. If that isn't worth it to you to save then happy dreaming to you.

>I sleep 10 to 11h per night.

Yeah that's called over-sleeping sir. It may be indicative of a health issue you should get checked out. You might not want to be so quick to stake claim to autonomous functions. It's not like you're willing yourself to sleep longer; your body just isn't functioning normally.