If you've just downed your fifth cup of coffee and you seem to be hearing things that aren't actually there, well, you might want to blame the caffeine in your cup of Joe.Australian researchers found that drinking five regular cups of caffeinated coffee may raise the risk of auditory hallucinations, according to a small study published in the journal Personality and Individual Differences.LaTrobe University researchers asked 92 people with varying levels of caffeine intake and stress listen to three minutes of white noise via headphones.