Track your caffeine in Gyroscope

Photograph or type your coffee, tea or can and Gyroscope One finds the caffeine in it, then shows your daily total and your last cup next to your bedtime and your sleep.

That's the method from the guide, kept for you every day: the milligrams in your actual cup, the time of the last one, and your nights right beside them, so you can see what moving the last cup earlier does.

See Gyroscope OneGet Gyroscope

What you get with Gyroscope One

• Caffeine found in your drinks. Photograph or type your coffee, tea or can, and the caffeine is counted with the drink, with nothing separate to log. Caffeine timing in Gyroscope.
• Your last cup next to your bedtime. Your daily total, and the time of your last caffeine beside when you went to sleep.
• The curve across your night. Your morning sleep report in Gyroscope One draws the caffeine curve across your night, so you can see what was still in you at bedtime. The sleep report.
• Your caffeine gene. Upload your 23andMe or Ancestry raw file once and Gyroscope One uses your CYP1A2 gene to set your caffeine half-life at 4, 5.5 or 7.5 hours. It's a starting setting, since the pill, pregnancy and smoking move your half-life more than the gene does (your genes and caffeine).

Do it once without an app

Spend one week as you are now and one with your last cup earlier or smaller. On a ring or watch, compare deep sleep and time awake in the night. Without one, write down each morning how long you took to fall asleep and how rested you feel from 1 to 5. Is my coffee keeping me up? builds the plan around your own drink and bedtime, and the cutoff clock gives you the latest time for it.

When to see a doctor

Too much caffeine can make your heart race or flutter, raise your blood pressure and leave you jittery or anxious. Those are a reason to stop for the day. See a doctor if your heart races or skips often, and ask your doctor or midwife how much is right for you if you're pregnant or take a daily medicine.

Call 911 for chest pain, fainting, a seizure or trouble breathing. If someone swallowed caffeine powder or pills, call Poison Control at 1-800-222-1222.

Gyroscope is an iPhone app for adults 18 and older.