There’s a chemical that your brain produces called Melatonin, and it makes you feel sleepy.
Your brain builds melatonin at night and gradually gets rid of it in the morning when the sunlight hits your eyes.
If you live an area in the world where sunrise is quite late in the morning or if you use black out blinds, your brain will not activate the process to break down the Melatonin cause your blocking the morning light.
That’s one factor, your body clock can be another reason.
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