And while that high ranking was fueled in part by a major heat wave out West, a big factor was the very warm
nighttime temperatures across a large swath of the country.
The investigation of self - reported sleep patterns and
nighttime temperatures across the United States is one of the first studies to provide evidence that rising temperatures, driven by climate change, could affect human sleep.
Not exact matches
Overall, the results showed if
nighttime temperature increased 1.8 °F ahrenheit above normal
across the United States for a month, people would report 9 million more nights of insufficient sleep during that period.
The researchers studied these CDC reports of inadequate sleep levels from 765,000 individuals
across the country alongside city - level
nighttime temperature data from 2002 to 2011.
Record - breaking
nighttime temperatures have already been increasing
across 90 percent of the studied areas, the research suggests, and these records may increase by at least fivefold
across half of Europe and a quarter of East Asia.
When heatwaves and record
temperatures are found all
across North America, Belize enjoys lovely weather in August with daytime highs of just 86F (30C) and
nighttime lows at a perfect 78F (26C).
Scientists sifting for trends in record high and low
temperatures across the United States have found more evidence of long - term warming of the climate, with the biggest shift coming through a reduction in record low
nighttime temperatures.