FROM THE BBC:
'Visions link' to coffee intake
People who drink too much coffee could start seeing ghosts or hearing strange voices, UK research has suggested.
People who drank more than seven cups of instant coffee a day were three times more likely to hallucinate than those who took just one, a study found.
A Durham University team questioned 200 students about their caffeine intake, the journal Personality and Individual Differences reported.
However, academics say the findings do not prove a "causal link".
They also stress that experiencing hallucinations is not a definite sign of mental illness and that about 3% of people regularly hear voices.
Besides coffee, caffeine is found in tea, energy drinks and chocolate