Caffeine & Sleep Tracker | Quantify Your Cognitive Bio-Hacking
A free bio-hacking benchmark for how caffeine, sleep debt and circadian timing actually move your reaction speed in milliseconds — not in feelings.
What Sleep Loss Does to Your Reaction Window
Peer-reviewed studies (Lim & Dinges 2010, Walker 2017) show that even a single night of restricted sleep slows simple reaction time by 60–120 ms and roughly doubles lapse rate. This test lets you see that number on yourself.
What Caffeine Actually Does — and Doesn't Do
Caffeine (≈200 mg) typically lowers simple reaction time by 20–40 ms within 30–45 minutes, but micro-timing precision can drop slightly because of mild tremor and over-arousal. Run the test before your coffee and 40 minutes after to see your personal curve.
A Simple 7-Day Bio-Hacking Protocol
1. Test every morning at the same time. 2. Log hours slept and caffeine in mg. 3. After 7 days, compare your fastest-vs-slowest day. 4. Adjust caffeine timing and bedtime — re-test.
Run your baseline test now
FAQ
How often should I test?
Once in the morning and optionally 40 min after caffeine for a clean before/after delta.
Is this medical advice?
No — it is a self-tracking precision benchmark, not a clinical tool.
Does the app store my data?
Your results live in your account; no health data is sold or shared.