It’s called the circadian rhythm: it’s our internal clock. With age, it tends to get ahead.
In practical terms, the desire to go to bed comes earlier… and so does waking up.
If you fall asleep around 9 p.m., waking up at 3 a.m. already represents about six hours of sleep. This isn’t necessarily a disorder, but a natural evolution of the circadian rhythm.
This phenomenon often appears after a change in lifestyle: retirement, reduced social activities, less structured days.
