https://caffeine-vs-water.app/blog/ Guides on caffeine, sleep and hydration. en https://caffeine-vs-water.app/blog/how-long-does-caffeine-last https://caffeine-vs-water.app/blog/how-long-does-caffeine-last Sat, 26 Sep 2026 09:00:00 +0000 Caffeine peaks in under an hour but takes 5 hours to drop by half, and much longer if you're on the pill or pregnant. Here's the hour-by-hour timeline for a cup of coffee. https://caffeine-vs-water.app/blog/when-to-stop-drinking-coffee-before-bed https://caffeine-vs-water.app/blog/when-to-stop-drinking-coffee-before-bed Sat, 26 Sep 2026 09:00:00 +0000 "No coffee after 2 pm" is too simple. The right caffeine cutoff depends on how strong the drink is and how fast you clear it. Here's a cutoff table for common drinks, backed by sleep studies. https://caffeine-vs-water.app/blog/does-coffee-dehydrate-you https://caffeine-vs-water.app/blog/does-coffee-dehydrate-you Sat, 26 Sep 2026 09:00:00 +0000 Coffee is a mild diuretic, but for regular drinkers a normal cup hydrates about as well as water. Here's what the studies show, where the myth came from, and when caffeine does make you pee more. https://caffeine-vs-water.app/blog/how-much-caffeine-is-too-much https://caffeine-vs-water.app/blog/how-much-caffeine-is-too-much Sat, 26 Sep 2026 09:00:00 +0000 The FDA says up to 400 mg of caffeine a day is fine for most adults, but that number hides a lot. Here's what 400 mg looks like in real drinks, who needs less, and the signs you've had too much. https://caffeine-vs-water.app/blog/how-much-water-should-you-drink-a-day https://caffeine-vs-water.app/blog/how-much-water-should-you-drink-a-day Sat, 26 Sep 2026 09:00:00 +0000 The "8 glasses a day" rule has no solid science behind it. Here's what the official guidelines say, how to work out your own daily water goal from your weight and activity, and whether coffee counts. https://caffeine-vs-water.app/blog/caffeine-and-pregnancy https://caffeine-vs-water.app/blog/caffeine-and-pregnancy Sat, 26 Sep 2026 09:00:00 +0000 Most guidelines say to keep caffeine under 200 mg a day in pregnancy. Here's what that means in real drinks, why caffeine lasts up to three times longer when you're pregnant, and how to stay under the limit. https://caffeine-vs-water.app/blog/caffeine-content-chart https://caffeine-vs-water.app/blog/caffeine-content-chart Sat, 26 Sep 2026 09:00:00 +0000 How much caffeine is in an espresso, a grande, a can of Monster or a cup of green tea? A side-by-side chart of popular drinks by size, with what each one means for your daily limit and your sleep. https://caffeine-vs-water.app/blog/how-caffeine-affects-sleep https://caffeine-vs-water.app/blog/how-caffeine-affects-sleep Sat, 26 Sep 2026 09:00:00 +0000 Caffeine doesn't just keep you awake. It cuts deep sleep, delays your body clock and costs you about 45 minutes a night, often without you noticing. Here's how it works and how to keep coffee without losing sleep.