Rising global temperatures are not only causing climate catastrophes, but also less noticeable but dangerous consequences: sleep disruption. Of particular concern are nighttime temperatures, which are increasingly exceeding 27°C. A new study published in the journal Nature Communications has shown that nighttime heat is seriously affecting sleep quality and triggering the development of obstructive sleep apnea (OSA).
After analyzing data from 116,000 people from 41 countries, scientists discovered a disturbing pattern: on hot nights, the frequency of apnea episodes increases by 45%, especially in people with an already elevated AHI index. This leads to frequent awakenings, breathing disorders and deterioration of well-being. In the long term, it leads to chronic fatigue, cardiovascular diseases and a decrease in quality of life.
But it's not just a medical problem. Scientists estimate that in 2023 alone, humanity will have lost more than 785,000 years of healthy life due to heat-related sleep disorders. The economic losses are estimated at $30 billion in 29 countries, largely due to decreased productivity among workers who don't get enough sleep.
The problem is particularly acute in countries where air conditioning is not standard. Climatologist Nick Obradovich notes that even without a diagnosis of OSA, people are starting to fall asleep later and wake up earlier, which reduces deep sleep phases. And sleep expert Bastien Leschat adds that if global temperatures rise by another 1.8 °C, the number of cases of sleep apnea could triple by the end of the century.
In order to reduce the negative impact of heat, experts advise:
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use fans or air conditioners;
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choose a light blanket and cooling mattresses;
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ventilate the room at night or in the morning;
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Avoid heavy meals and alcohol before bed.
Sleep is as essential to survival as food or water, and in the face of climate change, ensuring quality sleep becomes a top priority.
