While people assume that a cup of decaf coffee is 100 percent caffeine-free, it actually contains 3% of caffeine given that USDA regulations require decaffeinated coffee to be just 97% caffeine-free.

These 3% may seem harmless but in fact they can keep you up at night, noting that some decaf brews have more caffeine than others.

“In a 12 oz cup of specialty coffee, there is typically between 150 and 300 mg of caffeine. In a 12 oz cup of specialty decaffeinated coffee, there’s typically between 5 and 15 mg of caffeine,” Director of Roasting, Jonathan Withers, explained.

When coffee is brewed for a long period of time, it holds more caffeine; so the quicker it is brewed, the lesser the caffeine it contains.

“You can really taste the difference. It’s more expensive, but it is more ecologically friendly because you’re not using chemicals,” chief marketing officer of Joyride Coffee, Paul Toscano, told Business Insider, recommending the selection of coffee that was processed using the Swiss Water method, which can remove 99% of the caffeine from the beans.