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Wondering if Northern Europe has developed some sort of genetic immunity/reduced influence to caffeine. With the Netherlands having a an average of 2.4 cups of coffee a day, one would expect chronic insomnia, yet this is not the case.

I live in Denmark, where the average is 1.27 cups a day, and I oftentimes go over 10 cups a day of coffee, and I know a handful of people who're either up there with me, or drink even more.

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As I understand it, the research is not completely conclusive but the claim is that there is significant habituation effect. I've also heard that restlessness/insomnia are just as likely to be caused by withdrawal effects in the evening as they are by high consumption. Withdrawal effects have similarities to high usage, and anecdotally if I'm drinking a lot of coffee but stop early in the day I often have problems sleeping.

Huh, seems almost comical that withdrawal produces these symptoms. Thanks for your insight :-)

When i drink past 10 cups a day it wears off pretty fast. Never had a problem with sleeping.

More common is general anxiety. If you are anxious at all, tons of coffee tend to spike that up.

Past 3 cups seems to harm my sanity more then it helps.

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