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The secrets of sleep unveiled with science

4 episodes
  • 1
    What do we really know about our dreams?
  • 2
    What happens in our brains during sleep?
  • 3
    How to improve sleep, according to science
  • 4
    How better sleep can protect cardiovascular health
Épisode 1/4
On March 5th, 2025
5 min reading time
Delphine Oudiette
Delphine Oudiette
Inserm Research Director and Co-Director of DreamTeam at Institut du Cerveau in Paris
Claudia Picard-Deland
Claudia Picard-Deland
Postdoctoral Researcher in the Department of Psychiatry and Addictology at Université de Montréal

Key takeaways

  • Research on dreams shows that they begin as soon as we fall asleep, and it is possible that different regions of the brain do not fall asleep at the same rate.
  • Among the hypotheses on their function is the idea that dreams simulate threats and regulate emotions, allowing us to better manage situations or states experienced in dreams.
  • Studies on dreams are based, for example, on reports from dreamers or on laboratory experiments, but their level of evidence is generally low.
  • To better understand dreams, it is important for researchers to collaborate and share results on open databases.
  • Ultrasound imaging and recent discoveries about windows of connection with the outside world during sleep are avenues for better understanding.
Épisode 2/4
On September 3rd, 2024
5 min reading time
William Wisden
William Wisden
Professor at Imperial College London, Member of the Academy of Medical Sciences and the Royal Society

Key takeaways

  • Sleep is one of the most fundamental human functions, but research is still lacking.
  • The hypothesis that we sleep to cleanse our brains of toxins may not be so obvious.
  • Research is starting to offer clues as to how our bodies keep track of sleep deprivation over time.
  • Certain molecules, such as interleukin 6 and adenosine, are involved in regulating sleep in response to exhaustion.
  • This research could also help develop better sleeping pills, which could induce biomimetic deep sleep.
Épisode 3/4
On September 25th, 2024
4 min reading time
Armelle rancillac
Armelle Rancillac
Researcher in Neuroscience at Inserm and Collège de France

Key takeaways

  • In 2024, the French will sleep an average of 15 minutes less per day than in 2023, with an overall drop in sleep time of 1 and a half hours over 50 years.
  • Before resorting to medical treatments, doctors recommend improving lifestyle habits to alleviate sleep disorders.
  • Sleep is regulated by sleep pressure and the body clock, which are influenced by light, meals, physical activity, and social interaction.
  • Exposure to daylight and avoiding screens in the evening are effective strategies for synchronising the body clock.
  • Regular physical activity and a glucose-rich evening meal promote better sleep, by stimulating the production of serotonin and adenosine.
Épisode 4/4
On September 18th, 2024
3 min reading time
JP Empana
Jean-Philippe Empana
Physician and INSERM Research Director at Paris Cardiovascular Research Center (PARCC)

Key takeaways

  • The number of deaths linked to cardiovascular disease (CVD) is estimated to have risen by 60% since 1990, making it the leading cause of death.
  • Considerable research efforts are being made to better identify risk factors and markers, so that action can be taken as far upstream as possible.
  • Many risk factors have already been identified (smoking, diabetes, alcohol, sedentary lifestyle, etc.), but researchers are increasingly interested in sleep.
  • According to the work of a team of researchers, the “better” the sleep, the lower the number of cases of CVD.
  • According to the study, it is never too late to improve the quality of your sleep and preserve your cardiovascular health.