Samples underwent high-performance liquid chromatography, and the “clear winner,” the company says, was Black Insomnia at “an incredible” 17.5 grams of caffeine per kilogram of coffee.

Black Insomnia Coffee, which made its debut in South Africa last year, packs a serious punch. According to creator Sean Kristafor, the java jams 702 milligrams of caffeine into just 12 ounces.

Here's everything you need to know about Black Insomnia Coffee, which is available to buy on Amazon. The $20 bag of coffee claims to be the "World's strongest coffee" ...

Sleep specialist and clinical psychologist Michael Breus says that the best way to mitigate insomnia is to cut off coffee and caffeine consumption by noon. This will be a tall order for coffee lovers.