A study from the University of Copenhagen looked at billions of records taken from sleep-tracking wristbands across 68 countries suggests that people are already losing 44 hours of sleep a year because of hot nights. And with record-breaking temperatures happening more frequently because of climate change, Kelton Minor, lead author of the study, tells us the extent of this problem, who is most affected by it, and why it’s so important for people to get a good night’s sleep.

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