A new study conducted by researchers from La Trobe University in Melbourne suggests that drinking over five cups of coffee a day could lead to hallucinations.
More than 90 people participated in the study which looked into the effect of caffeine on those who were stressed out.
The participants were given different doses of caffeine and were made to listen to constant fuzzy sound. The researchers found that those who had over 200mg of caffeine in a day were more likely to hear sounds that were not played.
Stating that people need to be aware of the effect of high levels of caffeine, lead researcher Professor Simon Crowe said, "The combination of caffeine and stress affect the likelihood of an individual experiencing a psychosis-like symptom. Caution needs to be exercised with the use of this overtly "safe" drug."