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army1987 comments on Things I Wish They'd Taught Me When I Was Younger: Why Money Is Awesome - Less Wrong
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My introspection had similar results about sleep deprivation and mental performance before I tried Anki. Now that I've actually measured my performance with the software, I know it can be as low as 50 % of my peak performance measured in latency of recall when even slightly (2-3 hours) sleep deprived. Of course, Anki measures memory, not IQ.
This experience made me update significantly in the direction that my introspection, at least in the case of mental performance, sucks. My social life has suffered as a result of this realization.
My scores at stuff like Lumosity and Quantified Mind tend to always be great in the morning (a couple hours after I wake up), but unless I slept enough the previous night they suck balls in the early afternoon; they get better again in the evening if I take a nap in the afternoon. My self-perceived wakefulness and willpower levels vary similarly, but several hours earlier (i.e. I underestimate my mental performance right before lunch and overestimate it right after my afternoon nap).