#210 – Matt Walker: Sleep
Lex Fridman Podcast
The Four Components of Coffee
Caffeine has a halflife of about five to six hours, meaning that after five to six hours, 50% of that on average for the average adult is still in the system./nCaffeine has a quarter life of 10 to 12 hours, meaning that if you have a coffee at noon, a quarter of that caffeine is still circulating in your brain at midnight.
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