You don’t have insomnia. You just drink coffee past your "Caffeine Wall."

Generic advice says "Stop coffee at 2 PM." That's wrong. Everyone’s metabolism is different.

I built an iOS app (ARC) to calculate your personal Caffeine Wall based on your wake time and chronotype.

- It tracks the 90-minute morning delay.
- It warns you when caffeine will still be in your system at bedtime.

Since I started following my ARC "Wall," my sleep onset went from 40 mins to 15.