Something You Should Know
How to Get the Best Sleep of Your Life & How to be Gracefully Assertive - SYSK Choice
Aric Prather
Caffeine certainly can increase alertness, but it's in our system for a long time. And so caffeine has a half-life of about six hours. And so that means that after six hours, half of it is still in your system. So if you have a double espresso at 4 p.m., at 10 p.m., you still have a single espresso in your system. We know that that can keep people alert.
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