The original study on blue lights was on a small number of humans, and the delta in sleep was less than 20 mins per night. So if this isn't a useful study, I wo

The original study on blue lights was on a small number of humans, and the delta in sleep was less than 20 mins per night. So if this isn't a useful study, I would hardly consider the original blue light study useful or conclusive either. The only reason why you heard about the original study was because it made the headlines.