Part of the problem with most other studies are that it is very had to metricize on-the-job performance and sleepiness. Some of the cool things about this study are: 1) very clear metrics to measure performance (reaction time) 2) very consistent testing (repeated trials over an actual 9 hour flight, then over 4 days of additional flights) 3) additional non-subjective metrics for sleepiness (the teams strapped an EEG on the pilots while they were flying to monitor brain activity!!!)

It's frustrating, but most health and wellness magazines are a bit like an echo chamber with no clear references to source data.