What could be a reason I get like no sleep?

Like I realized recently that the amount of sleep I get isn't healthy. I work 6am but technically am scheduled at 7am. Then, I end at 4pm. But I get home and sleep. By that maybe you're thinking I'm getting plenty of sleep. But no, I sleep 5pm until anytime in between 12am and 2am. Then I leave for work at 5am. Like I don't understand why I can't stay up until 9pm and sleep at a normal time.

What could be a reason I get like no sleep?
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