How long is 4 hours of sleep sustainable?

[goldminer]

Just a general question.
If you guys have any tips like if alternating between 4,5 hours can be better than 4 hours straight everyday. Or maybe eating/drinking something to keep yourself awake.
I might have to sleep this much only, so any advice will be helpfull.

I used to sleep 3 hours a day
Trust me that 3 hrs cost me 8 hrs of lack of energy , tiredness , no able focus and literally sleeping while you wake up
Trust me let the subconscious mind do its thing or else .....,

 

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