It’s three or four in the morning. You suddenly open your eyes, silently, without a nightmare, for no apparent reason. The house is quiet, the world seems frozen, and yet… you’re awake and can’t fall back asleep immediately.
If this scene sounds familiar, you belong to the silent majority. Millions of people experience these periods of wakefulness at night, almost always at the same time. This phenomenon, which has given rise to myths, spiritual beliefs, and fears, is nevertheless based on very concrete mechanisms of the body and brain.
So, what happens if you wait 3 or 4 hours in the morning?
