> contrasting 200 mg of caffeine against a placebo condition Burried in the middle: > The participants reported moderate caffeine consumption, equivalent to o

> contrasting 200 mg of caffeine against a placebo condition Burried in the middle: > The participants reported moderate caffeine consumption, equivalent to one to three cups of coffee per day. All participants were non-smokers and free of drugs or medicine which could influence the sleep-wake cycle. Subjects also reported no sleep complaints, night work, or transmeridian travel in the 3 months before the recording. > The participants arrived at the laboratory 6–8 h before their habitual sleep time and left 1–1.5 h after habitual wake up time. Bedtime and wake time in the laboratory were determined by averaging each participant’s sleep-wake cycle from the sleep diary. The total dose of caffeine administered was 200 mg (100 mg per capsule) which is considered to be moderate (equivalent to 1–2 cups of coffee) and induces significant changes in the sleep of young subjects23. Two-piece telescopic hard capsules were used, allowing the ingestion of caffeine without oral contamination, in a double-blind cross-over design using stratified randomization. I doubt someone drinking 1-3 cups per day would feel that 200 mg single-shot is "normal." That's 2-3 cups in one go. For me, it would be like drinking it around 3pm. I would fit the cohort. If I take a 200 mg caffeine capsule at 3pm, I get pretty fucked up, and I'm wondering what the self-reported effects were at the time they went to bed. Did they feel normal? It sounds like this is one of those studies that are meant for other researchers, not the public, because the actual evidence is about effects that don't match daily lives. This type of caffine ingestion would be noticeable, and you'd pretty quickly dial it down if it was felt the way I suspect it did feel.