How long does caffeine last in your system and affect sleep? How does having caffeine multiple times in a day affect that?

How long does caffeine last in your system and affect sleep? How does having caffeine multiple times in a day affect that?

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  1. Question: How long does caffeine last in your system and affect your sleep? How does having caffeine multiple times a day affect that?
    The half life of caffeine is 3–7 hours. It varies a lot because so many things can alter it. Your genetics can cause your body to clear caffeine from your body faster or slower than other people. Medications and liver function can affect it.
    The half life of a compound is how long it takes for the amount of it to drop by 50% in your body. So if you consume 10mg of caffeine and it has a half life of, say, 3 hours, after 3 hours only 5 mg of caffeine will remain in your system. After another 3 hours only 2.5 mg will remain. Etcera.
    In general if you use 12 hours as a baseline you shouldn’t have any problem with sleeping related to caffeine. 12 hours after consuming caffeine the level of caffeine in your system is usually low enough that it shouldn’t disturb your ability to sleep.
    But as you can see with the half life explanation, if you continue to consume caffeine multiple times in a day you will alter how long it takes for the levels to be low enough to not bother your ability to sleep. Example of this assuming a 3 hour half life again: if you consume 10mg of caffeine and 3 hours passes the level is down to 5 mg. But if you consume another 10mg of caffeine at that point your caffeine load is 15mg now. So the amount of caffeine you consume adds to the amount of caffeine that is still in your system from the last time you consumed it. The amount of caffeine will then reduce following the half life of it until it is too low to matter to your ability to sleep or you consume more caffeine and it will most likely not reduce to a low enough amount to not bother your ability to sleep before you want to sleep.
    Caffeine – Wikipedia
    Then you also have the situation where heavy caffeine users don’t seem to have their ability to sleep disturbed by caffeine consumption. That is related to the body becoming not as sensitive to the effects of caffeine if you use it heavily.

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