Can't fall asleep at night?

Hi, I'm 14 and at night when i try to go to sleep i just end up laying there for about an hour. I just can't stop thinking about tomorrow or what happened today. And sometimes a song will play over and over in my head and i just can't stop it. If anyone knows why this is happening please help. Thanks in... show more Hi, I'm 14 and at night when i try to go to sleep i just end up laying there for about an hour. I just can't stop thinking about tomorrow or what happened today. And sometimes a song will play over and over in my head and i just can't stop it. If anyone knows why this is happening please help. Thanks in advance
Update: I try to eat healthy and exercise almost everyday.
Update 2: I go to bed around 9:30-10:00 and wake up about 6:30 on weekdays and 7:00-8:00 on weekends
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