May 24, 2022 07:00:00

The sleepless nights caused by global warming are steadily worsening the 'sleep' of people around the world.

It is predicted that

midsummer days will continue in western Japan for the week starting May 23, 2022, and many people will feel that it is still hot in May. Recent studies have shown that climate change, which leads to increased temperatures not only during the day but also at night, reduces sleep time around the world and threatens health hazards.

Rising temperatures erode human sleep globally: One Earth
https://www.cell.com/one-earth/fulltext/S2590-3322(22)00209-3

Hotter nights are already making us lose sleep --Scime x
https://www.scimex.org/newsfeed/hotter-nights-are-already-making-us-lose-sleep

Climate Change Is Depriving The Whole World of Sleep. Here's How Much We Stand to Lose
https://www.sciencealert.com/global-seep-tracking-data-reveals-we-re-all-losing-sleep-thanks-to-global-warming

Previous studies have shown that global warming increases fatal accidents and that suicide rates increase as temperatures rise, but the underlying mechanism has not been identified. Although some studies suggest that elevated temperatures adversely affect sleep time and quality, which are essential for health, many of them rely on subject self-reports or are regionally biased. increase.

Research results that 'suicide increases when the temperature rises' are announced --GIGAZINE

by Anthony Easton

To pinpoint the effects of heat on human sleep, a research team led by Kelton Miner of the University of Copenhagen, Denmark, used anonymous data collected from sleep tracking wristbands equipped with accelerometers. The we. The data analyzed included more than 7 million sleep records provided by 47,628 people in 68 countries around the world.

The research team investigated the relationship between sleep data such as total sleep time and sleep onset time and temperature data in the area where the data was collected, and found that sleep time is less than 7 hours when the nighttime temperature exceeds 25 degrees Celsius. It turns out that the probability goes up. The sleep time of 7 hours is said to be the lower limit of the sleep time required for a person to stay healthy. The analysis also found that on very hot nights above 30 degrees Celsius, sleep time was reduced by an average of 14 minutes.

Some may find that just 14 minutes isn't a big deal, but past studies have shown that 'a single night's sleep deprivation can have a significant impact on your body and soul.' Also, once you get sleep deprived, you can't recover without getting enough sleep for days, so the long-term effects of chronic sleep deprivation from the tropical nights every day are huge.

In fact, the research team predicted the number of days of sleep deprivation in as many as 21 climate models, and found that in the future, sleep deprivation will occur 13 to 15 days a year.

'This is the first planetary study to prove that temperatures above average temperature impair human sleep, which puts people to sleep in hot climates,' said Miner. It has been shown to delay time and get up earlier. '

The study also found that climate change has a greater impact on sleep time in low-income countries and older people, with women more susceptible than men. This may be related to the availability of air conditioning, but the data collected does not include the presence or absence of air conditioning. Therefore, the research team wants to conduct research focusing on the rise in temperature in cases where the air conditioner cannot be used in the future.