That’s very helpful information, thanks, @ontopofthehill Re the caffeine, I suspect that the level and frequency that you are used to has more to do with the effect than any other factors. The coffee served at our favourite posh farm shop has a lot more of a kick than the other places we visit. I’ve made the mistake of having a second cup when we have had lunch there with friends, and have been distinctly light headed when we came out. And slept rather worse than usual.
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Re the caffeine, I suspect that the level and frequency that you are used to has more to do with the effect than any other factors. The coffee served at our favourite posh farm shop has a lot more of a kick than the other places we visit. I’ve made the mistake of having a second cup when we have had lunch there with friends, and have been distinctly light headed when we came out. And slept rather worse than usual.