True, but this isn't necessarily a showstopper. Unless you think pilots react to sleep differently or are grossly more/less sleep-deprived than everyone else, i

True, but this isn't necessarily a showstopper. Unless you think pilots react to sleep differently or are grossly more/less sleep-deprived than everyone else, it's not implausible to assume it generalizes. Every study has flaws, but rarely are they so awful the entire result should be discarded.