For many, coffee is a morning ritual, and the daily brewing routine gets us started as much as the drink itself does. Studies continue to tout the health benefits of a cup of Joe, which is welcome reassurance, but some aspects of coffee, especially caffeine, don’t always work for people.
For some, a cup or more can lead to sleep issues even hours after consumption. People with a particular genetic variation that makes them sensitive to the stimulant have it even worse: The amplified effects may cause a racing heartbeat, headache, jitters, and anxiety, in addition to potential insomnia. Yet other people are just plain allergic.
