Caffeine Tools
Sleep-friendly decisions, fast

Guides

Short, practical explanations that support the tools and help you make better timing decisions.

Readable Non-hype Tool-linked

Caffeine half-life explained

What half-life means, why it varies, and how to pick a sensitivity tier.

Caffeine and sleep: why 6 hours matters

A practical rule-of-thumb and what to do if you’re sensitive.

How long does caffeine last?

A timeline mindset + examples that tie back to the calculators.

Caffeine sensitivity: signs and adjustments

How to pick conservative settings and learn from your sleep results.

Hidden caffeine sources (and why it surprises people)

Tea, chocolate, pre-workout — small doses that add up.

A sleep-friendly caffeine strategy

A simple plan: timing, dose, and “experimenting” responsibly.