But as dawn approaches, the cycles change.
Sleep becomes lighter, more unstable, and therefore more susceptible to disturbances.
It is precisely between 3 a.m. and 4 a.m. that the majority of sleepers enter this fragile phase.
A faint noise, a movement from a partner, a change in temperature, or an internal bodily signal can be enough to trigger awakening.
So you’re not dreaming: these hours correspond to a biological window where sleep is intermittent.
Stress, anxiety: the real disruptors of the early morning
The brain, partially awakened, then restarts cognitive activity, sometimes abruptly.
This phenomenon is even more pronounced in people suffering from:
- anxiety,
- mental overload
- of emotional exhaustion,
- or chronic stress.
Thus, many people find that they always wake up at the same time, as if their brain has memorized this pattern. And in a way… that’s what happens.
When blood sugar affects your waking
A lesser-known but equally important factor concerns glucose regulation. Even at night, the body must maintain a stable blood sugar level.
If blood sugar drops:
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