Global warming is directly responsible for a deterioration in sleep, according to a study published this Friday, May 20 in the scientific journal

One Earth

and relayed by

The Guardian


This phenomenon would be due to the fact that temperatures increase more rapidly at night than during the day.

According to the researchers, the number of hours of sleep lost on average per year and per person due to global warming would amount to 44. According to the study, the loss of sleep would be higher by about a quarter. for women than for men.

It would also be twice as high for people over 65 and three times as high for people not living in a developed country.

Adverse health effects 

Scientists asked 47,000 people from 68 countries to wear a sleep tracking bracelet.

They compiled data from seven million nights between 2015 and 2017. According to the research manager, these results could only represent "the tip of the iceberg", low-income people living in hot countries underrepresented in this study. 

Why does heat lead to sleep erosion?

Because the body needs to cool down before falling asleep.

This explains why people living in underdeveloped countries are more affected because they are less likely to have access to cooling devices such as air conditioning.

The deterioration of sleep can have devastating effects on health with increased risks of heart attacks, suicides, accidents.


Sleep: A study establishes the ideal length of a night for the over 40s


Global warming: 50% chance of crossing the +1.5°C threshold within 5 years, according to the UN

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