Caffeine type
Slow Clearer
Caffeine lingers longer
Caffeine sticks around in your system. An afternoon drink can still be working when your head hits the pillow.
What this means for your day
A coffee at 2pm leaves around 40mg still active by 11pm, against a bedtime limit closer to 60mg. That single cup uses up most of your margin on its own, which is why afternoon coffee and poor sleep are more tightly linked for you than for the people telling you it is fine.
What to watch for
Slow clearers often do not feel wired at night. Caffeine at this level does not keep you buzzing, it quietly blocks the pressure to sleep. Lying there tired but not sleepy is the signature, and it is easy to blame on stress instead.
Get your actual curve, not a bucket
This result comes from three questions. The app models your real clearance from your own logged drinks, then gives you a sleep-safe cutoff, crash forecast, and jitter threshold that update as your day goes.
Download Caffeinly → Retake the quizA quick read from three questions, not a lab test. Figures come from a standard one-compartment model using this type's average half-life and a 95mg coffee. General wellness information, not medical advice.