The Caffy Blog

Caffeine, sleep & science

Short, source-backed guides on how caffeine really works, and how to get its upside without wrecking your sleep.

July 13, 2026 · 4 min read

What is matcha? A simple guide to the green tea everyone's drinking

Matcha is powdered green tea you whisk into water, not steep. Here's what it is, how much caffeine it has and why it feels different from coffee.

July 13, 2026 · 4 min read

L-theanine: the amino acid behind matcha's calm focus

L-theanine is the compound that makes tea feel calmer than coffee. Paired with caffeine, it can sharpen focus while taking the edge off the jitters.

July 13, 2026 · 4 min read

Matcha health benefits: what the evidence actually says

Matcha is rich in antioxidants and L-theanine, and the research is promising. But it's worth separating the solid findings from the hype.

July 13, 2026 · 4 min read

How to make matcha at home (and pick a good one)

Good matcha is easy to make once you know the ratio and the whisk. Here's a simple method, plus how to choose a powder that isn't bitter.

July 12, 2026 · 4 min read

Caffeine before a workout: how much and when

Caffeine is one of the best-studied performance boosters, if you time it right. Here's the dose and timing that helps, without wrecking your sleep.

July 11, 2026 · 4 min read

Caffeine and ADHD: does it actually help?

Caffeine is a mild stimulant, so it can sharpen focus for a while. But it's no substitute for ADHD treatment, and it can wreck the sleep that keeps symptoms in check.

July 10, 2026 · 5 min read

Caffeine detox: the withdrawal timeline, day by day

Cutting caffeine? Withdrawal peaks around day one to two and fades within a week. Here's the hour-by-hour timeline, and how to make it easier.

July 9, 2026 · 4 min read

Too much caffeine: symptoms and what to do

Jitters, a racing heart, nausea and anxiety are your body flagging a caffeine overload. Here's how to spot it, and how to come down safely.

July 8, 2026 · 4 min read

How much caffeine is in energy drinks?

From an 80 mg Red Bull to a 300 mg Bang, energy-drink caffeine varies wildly. Here's a clear, brand-by-brand breakdown so you know what you're really drinking.

July 7, 2026 · 4 min read

Matcha vs coffee: caffeine, L-theanine and calmer focus

Matcha has less caffeine than coffee but pairs it with L-theanine. That's the reason it gives steady focus instead of a spike and crash.

July 5, 2026 · 4 min read

Does caffeine cause anxiety?

Caffeine doesn't invent anxiety, but it can amplify it, triggering the same racing heart and restlessness your body reads as fear. Here's the line between a buzz and the jitters.

July 4, 2026 · 4 min read

How much caffeine is safe during pregnancy?

Major health bodies agree: keep caffeine under 200 mg a day in pregnancy. Here's what that looks like in cups, and why your body clears it far more slowly now.

July 2, 2026 · 5 min read

How long does caffeine stay in your body?

Caffeine's half-life is about 5–6 hours. Here's what that means for the coffee you drank this afternoon, and when it finally leaves your system.

June 30, 2026 · 5 min read

What time should you stop drinking coffee for better sleep?

A 2023 meta-analysis put a number on the old “no coffee after 2 p.m.” advice: stop about 8.8 hours before bed to protect your sleep.

June 27, 2026 · 4 min read

How much caffeine is in coffee, tea, espresso and energy drinks?

Espresso, drip, cold brew, green tea, Red Bull: a clear, source-backed comparison so you know what you're really drinking.

June 23, 2026 · 4 min read

Safe daily caffeine limits: how much is too much?

The FDA and EFSA agree on 400 mg a day for most adults, and 200 mg in pregnancy. Here's what those numbers mean in cups.

June 18, 2026 · 5 min read

How to cut back on caffeine without the headaches

Quitting cold turkey is why people fail. A gradual 1–2 week taper, plus an earlier daily cutoff, keeps withdrawal at bay.