I think it is a matter of habit, many have created a habit of getting up early and the brain responds to it by doing so, even if it has gone to bed late. In my case it is like that, however as you mention it is important for those who have not created the habit to go to bed early, have dinner before eight o'clock at night, sleep in a comfortable place, without light, without the TV on, do not take long naps or do it after 4 pm, among others.
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