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Global warming is leading to 44 hours less sleep per year

  The past seven years have been the hottest seven years on record.
  The World Meteorological Organization released a climate report on the sidelines of the 26th United Nations Climate Change Conference, pointing out these facts. Global warming will have “a profound impact on present and future generations,” the report said.
  Extreme weather events such as abnormal heat waves, floods, and droughts are gradually emerging. They are raging around the world, causing countries to suffer huge economic and property losses.
  Now, a study published in the journal “One Earth” on May 20, local time, has revealed another effect of global warming – making people “sleepless”…
  Is there a connection between the two?
  A research team from the University of Copenhagen in Denmark collected more than 7 million sleep records from more than 47,000 adults from sleep tracking devices in 68 continental countries, and comprehensively assessed daily meteorological data in the places where they lived.
  The results showed that on nights when the temperature was higher than 30°C, the per capita sleep time decreased by more than 14 minutes. As the temperature increased, the probability of sleeping less than 7 hours also increased significantly. Compared with the baseline temperature of 5°C to 10°C, the probability of getting less than 7 hours of sleep increased by 3.5 percentage points when the nighttime minimum temperature was higher than 25°C.
  It is worth mentioning that, as early as the early 2000s, “poor temperature” may have caused a considerable loss of sleep. According to the 2010 temperature model, at that time, each person lost up to 44 hours of sleep per year due to temperature, and “gained” an additional 11 “insomnia nights” (sleep time less than 7 hours).
  If the warming trend cannot be effectively curbed, the problem of global insomnia will intensify. By 2099, suboptimal temperatures could reduce average sleep duration per person by 50 to 58 hours per year.
  ”Our bodies have adapted to maintain a stable core body temperature (the internal body temperature), which is the mechanism that humans rely on to survive,” said Kelton Minor, lead author of the paper.
  ”Every night, they spontaneously perform some amazing tasks that most people are unaware of – by dilating blood vessels, increasing blood flow to the hands and feet, and dissipating heat from the inside of the body to the surrounding environment.”
  To facilitate heat transfer, the ambient temperature needs to be lower than the core temperature. Because of this, increased ambient temperature changes can also have a negative impact on sleep.
  ”In this study, we provide the first global evidence that higher-than-average temperatures are depriving humans of sleep,” Minor said. ”
  In a preliminary exploratory analysis, the researchers also investigated the effect of rising ambient temperature on sleep disruption (number of wake-ups during the night). They found that temperature did not significantly alter the number of sleep interruptions. This also means that the sleep loss caused by climate change may not be compensated by the improvement of sleep quality.
  ”Obviously, current humans have limited adaptation to rising temperatures,” the researchers said.
  For the elderly, women and residents of developing countries, sleep disturbance caused by temperature is obviously more serious.
  For every 1°C increase in nighttime temperature, the “insomnia” effect on people over 65 years old is twice that of middle-aged people. This may be because a person’s temperature sensitivity may spike rapidly after age 60 and increase further after age 70.

  Recently, the Alpine Plant Diversity Research Team of the Kunming Institute of Botany of the Chinese Academy of Sciences collected the flower lifespan data of 818 species of angiosperms around the world, and studied the biogeographical pattern of plant flower lifespan and its influencing factors. Such as respiration and transpiration) are the main determinants of flower lifespan, providing a reference for the protection of plant diversity under global climate change. The results were published in New Botany.
  Flower lifespan refers to the duration of a flower from opening to withering, which is an important reproductive trait of plants. The flower lifespan of plants shows great variability, even among different populations of the same family, genus, or species.
  Using a Bayesian phylogenetic mixed model, the research team found that among all the angiosperms investigated, the average flower lifespan was 4.5 days, with the shortest being only 2 hours and the longest being 33 days, a 400-fold difference; The phylogenetic signal of the phylogeny indicates that the plants with closer kinship have more similar flower lifespans; flower lifespans increase significantly with increasing latitude and altitude, with an average lifespan of 2 days for flowers near the equator, compared with 50°N and 50°S latitudes. The average lifespan of the flowers reached 4.9 days and 3.9 days, respectively.
  Contrary to conventional wisdom, the flower lifespan of self-incompatible plants, herbaceous plants, insect pollinators, and large-flowering plants is no longer than that of self-compatible plants, woody plants, vertebrate pollinators, and small-flowering plants; each The higher the amount of pollen produced by a flower or the lower the pollination success index, the longer the flower lifespan; in areas of high temperature, drought, and strong solar radiation, plants tend to have short flower lifespans. When all biotic and abiotic factors were considered at the same time, only the temperature (negative correlation) and pollen number (positive correlation) in the flowering season had a significant effect on flower lifespan, which explained 26% and 10% of the variance, respectively, indicating that plant flowers The life is mainly affected by the temperature of the environment.

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