When you can't sleep, it means that your internal clock, based on a sleep-wake rhythm, has been disrupted. In most cases, it's stress that's responsible for poor sleep. If the difficulty in falling asleep persists, there may be multiple causes, such as a mental or psychological disorder (depression, for example) or a chronic illness. The symptoms of insomnia (difficulty falling asleep, waking up at night, waking up early) can be combined and evolve over time. Talk to your pharmacist or doctor.

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