I recently learned that chocolate contain significant amount of coffeine. 100g chocolate contain roughly as much as a cup of black tea. As a result I updated in the direction of not eating chocolate directly before going to bed.
I don't know whether the information is new to everyone, but it was interesting for me.
100g of pure chocolate is a lot. I normally eat 25g of 85% chocolate. That's probably an upper bound on a typical serving, diluted by other ingredients. For people who do not otherwise consume caffeine, it's a powerful dose, but for people who drink coffee every morning, it's probably not much.
Added: 25g of pure chocolate has about 10mg of caffeine, about the same as 25g of liquid coffee.
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