This article is taken from the monthly Sciences et Avenir n°936, dated February 2025.
"Screens and blue light, what you need to know. Exposure to blue light from screens strongly stimulates the receptors in the retina, thereby sending a 'daytime' signal to the biological clock that delays falling asleep […]" This warning from the National Institute of Sleep and Vigilance leaves no doubt as to the culprit. Associated with the increase in screen time – 32 hours on average per week according to the Regulatory Authority for Electronic Communications, Posts and Press Distribution (Arcep) – blue light keeps us awake and disrupts our sleep. While this belief has become widespread among the general public, several recent studies suggest that it is hardly based on scientific facts.
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