Your entire sleep system in your body is geared towards being tired and sleeping during the dark hours and being alert and awake during light hours. Sunlight and dark trigger the production of different hormones. If you’re sleeping during light hours you are likely getting less restful sleep than if you slept during the dark hours.
Permanently altering your sleep schedule in the way you’re describing can lead to serious health problems long-term. You can read up on [Shift Work Sleep Disorder](https://en.wikipedia.org/wiki/Shift_work_sleep_disorder).
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