Exposure to the blue light of screens reduces the secretion of melatonin, the sleep hormone that facilitates sleep. Exposure to this blue light before bedtime will therefore slow down the process of falling asleep. In addition, light stimulates activity and wakefulness, leading to a later onset of sleep. Finally, certain violent content such as video games or TV programs can generate tension and anxiety, making it difficult to fall asleep.

For further information, we recommend that you consult :

- Institut national du Sommeil et de la Vigilance website
- The Morphée network website (health network dedicated to the management of chronic sleep disorders)
- The ANSES website (Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail)
- The Santé Publique France website, and its documents on sleep