Cira: Caffeine Tracker & Sleep

Coffee keeping you up at night? Cira tells you the exact hour of your last cup, worked out from your bedtime and your body, so your coffee stays out of your night. Most trackers count the cups you drank. Cira counts what is left: caffeine climbs for about 45 minutes, then leaves at a rate set by your own metabolism, not by an average adult. Between a fast metabolism and a slow one, the difference is hours of sleep. WHAT YOU SEE FIRST • Active caffeine right now, in milligrams • The hour after which a normal cup starts costing you sleep • Whether tonight holds, and when you will be clear • The whole day as one curve: where the peak was, where it goes next TUNED TO YOU Smoking clears caffeine almost twice as fast. Contraceptives and pregnancy slow it down. After 65 it slows again. Cira applies all of it, and if you know your own half-life you can set it by hand. SLEEP JOURNAL Rate your…