The deepest tiredness is the kind that results from unsuccessfully struggling with a problem for a full day and quitting out of exhaustion
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Your intellectual one-rep max is a problem that defeats you in a day and leaves you in a state where you realize an all-nighter won't help
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I haven't worked on the sort of problem where an all-nighter helps since ~2002
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Could the increase in your age account for that? All-nighters are now useless to me, and it's not because of the problems I'm tackling.
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