In some people, caffeine can trigger the same type of physical feelings as anxiety. For example, caffeine stimulates the central nervous system and temporarily increases blood pressure and heart rate. 5
This can mimic feelings of anxiety. One study linked caffeine consumption with stress, depression and anxiety in secondary school-age children. 6
Caffeine can disrupt sleep and make it more difficult to relax and unwind in the evening. Remember, caffeine stays in your system for several hours after ingesting it – its half-life is around 5 hours. This means that from your cup of coffee, tea or energy bar, it takes 5 hours for half the caffeine to leave your system. So, having caffeine in your system makes getting to sleep and having a restful night more difficult. 7 This in turn can cause anxiety.