Follow-up to: Boring Advice Repository
Many practical problems in instrumental rationality appear to be wide open. Two I've been annoyed by recently are "what should I eat?" and "how should I exercise?" However, some appear to be more or less solved. For example, various mnemonic techniques like memory palaces, along with spaced repetition, seem to more or less solve the problem of memorization.
I would like people to use this thread to post other examples of solved problems in instrumental rationality. I'm pretty sure you all collectively know good examples; there's a comment I can't find from a user who said something like "taking a flattering photograph of yourself is a solved problem," and it's likely that there are other useful examples like this that aren't common knowledge. Err on the side of posting solutions which may not be universal but are still likely to be helpful to many people.
(This thread is allowed to not be boring! Go wild!)
It might be worth going to a sleep doctor; sleep apnea can really fuck up your metabolism, not to mention causing unbelievable akrasia. I would say sleep tests are a GOOD THING, something everyone should do. I had sleep apnea for years. It was like some eldritch monster was sucking away my willpower and I wasn't even aware. Within a few months of getting my mouth guard, which keeps my tongue from blocking my airway while in REM, I lost thirty pounds and gained an enormous well of mental stamina. A small minority of the "metabolically challenged" may just have undiagnosed sleep problems.
Since it was cheaper than a sleep study, I bought a self-adjusting CPAP on Craigslist and just tried it. Nothing miraculous occurred.