Nightmares: When should you really worry?. The nightmare is a completely normal physiological process, which serves to digest emotions and stress.

“Unfortunately, when it fails, with persistent distress, it has repercussions on the following night, resulting in a vicious circle,” says Professor Pierre-Alexis Geoffroy, head of the ChronoS Reference Center – Psychiatry, chronobiology and sleep. This article is reserved for subscribers. You have 78% left to discover. Flash sale -70% on digital subscription I ENJOY IT Already subscribed? Log in.