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The waiting 90 min for caffeine part is actually based on decent scientific evidence, but it's so damn hard.
Apparently the logic behind is that sleep neurotransmitters take a while to flush out in the morning, but drinking caffeine stops the flushing process and leaves you with leftover ones in your system. So as soon as the coffee wears off, you're way more likely to really crash.
I've tried to implement that habit, but ended up falling asleep at my work desk basically every day 🤷 (Although my doctor also says he's about 80% sure I have Narcolepsy, so that might have something to do with that)
Can you cite a study?
https://www.youtube.com/watch?v=yCJr49GU9yY
It seems like a very common misconception that is maybe somewhat correlated, but causality hasn't been found as far as I could find. Probably one of those things that are hawked by "wellness influencers" and "hack your life" youtubers without actual evidence.
Get a prescription for Modafinil.
Get out of here with your facts. I'll imbibe caffeine whenever the hell I want.
Just fuckin' around, no ill intent.
Be careful about what you take away from influencers like Huberman etc. They are businesses first and foremost, and while their business may involve giving good advice, they're ultimately driven by views which can lead them to exaggerate and overrepresent evidence for the sake of having new, compelling content.