Matthew Walker on sleep: what the evidence says · JRE #1109

What the evidence says 01 / RECORD

Walker claimed drowsy driving kills more people on the road than alcohol or drugs combined. Official U.S. data show the opposite: NHTSA's own reporting attributes 644 deaths to drowsy-driving-related crashes in 2024 (an estimated 800 in 2017), and NHTSA itself cautions that a precise count is hard to establish and that this figure is likely an underestimate. By contrast, CDC reporting of NHTSA fatality data shows 13,524 deaths in 2022 involved an alcohol-impaired driver alone, about 32% of all US traffic deaths that year and roughly 15-20 times the officially tallied drowsy-driving toll; CDC separately notes that drug-impaired driving deaths cannot be precisely quantified due to data limitations but would add further to the impaired-driving total. No government dataset shows drowsy-driving deaths approaching, let alone exceeding, alcohol-impaired driving deaths alone, even accounting for the broad agreement among researchers that official drowsy-driving figures undercount the true toll. This tracks published critiques of Walker's book "Why We Sleep" (by statistician Andrew Gelman and researcher Alexey Guzey) arguing its drowsy-driving statistics are unsupported by official traffic-safety data. Status: false.