Head to Settings and tap on the More tab at the end of the Wireless & networks tab. Step #1. image. Once inside, swipe to the bottom and hit the Emergency broadcasts button.
I have also heard that drinking peppermint tea (herbal) is good.The time it takes for the body to eliminate one half of a caffeine dose is normally between 3 to 12 hours. It is called the half-life of caffeine. Source(s): http://www.coffeefaq.com/site/node/127. seashells Â· 7 years ago. Thumbs up.
How long does it take for caffeine to wear off? Caffeine has a half-life of three to five hours in a person's system, so it remains in the body for eight to 14 hours, according to the American Academy of Sleep Medicine. The effects of caffeine in the blood system peak 30 to 60 minutes after intake.