Climate Change Is Already Making Americans Sleep Worse
A 765,000-person study argues that unusually warm nights are a public-health hazard.
In the fall of 2015, the worst heatwave in 25 years struck Southern California. Los Angeles saw two back-to-back 100-degree days, which set an October record and plagued the Long Beach marathon. San Diego, meanwhile, cooked in monthly temperatures 7.7 degrees Fahrenheit warmer than usual.
But the real weird weather came at night. For more than a week, San Diego’s nighttime low barely fell below 75 degrees, even in the coolest hours before dawn. It remains the hottest string
