We all know too much coffee can make you feel a bit shaky and twitchy but new research suggests excessive consumption can lead to hallucinations.

Researchers at Durham University suggest that 'heavy' caffeine use – equivalent to seven instant coffees a day – can make consumers more prone to hallucinations with some saying they feel the presence of dead people.

It is thought it's caused by caffeine exacerbating the effects of stress by stimulating larger amounts of the stress hormone cortisol.

Conduct a survey around your patch to see how much people caffeine people are drinking and eating and what effects it's having.