What could be the reason for this?

Hi guys. I'm 24 years old. When I lie down in my bed at night, I fall asleep late. I wake up during the night, I sweat, I can't sleep because of sweating. Then I sleep again, I wake up again. My sleep is constantly interrupted. What could be the reason for this? I've never had anything like this happen to me before.
What could be the reason for this?
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