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Yep, I just don't have time even to eat or sleep... but some productivity guys mention it as a key thing next to all other important stuff.

Yeah no, I was only kidding haha :P It's just something funny that I hear a lot in those motivational videos :)

Of course sleep is important! I would say 6 hours is enough.

6-7 hours.. yeah. Ah, those motivational videos I've been watching them for hours. Sometimes they are helpful.. but they are often just time wasters :P