I'd like to see a double blind study.. There's a biased with that study..it's so subtle that not many people would realize it.. People who are in the study are there because they have trouble sleeping. Things like stress can cause sleeping problems and high levels of stress have been linked to other serious complications so by taking the pills it is simply masking the underlying symptoms. It would only make sense that people who take the pills are at more risks but not because of the pills themselves