How can I fix or reset a broken sleep schedule naturally?

How can I fix or reset a broken sleep schedule naturally?
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I can fall asleep and wake up whenever I want, but I want to shift my biological clock so I can sleep and wake up at a specific time. If I close my eyes, my mind stays wide awake for hours. Do you think I should stay awake until my target bedtime?
How can I fix or reset a broken sleep schedule naturally?
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