Hello doctors, I am a night owl, I stay awake at night for study or sometimes keep playing video games, it has been 3 years, I have this routine. I usually sleep at 6 am and get up at 3,4 pm in evening. Now I want to change my routine, when I try to sleep at night I can't fall asleep no matter how much I try until it's 6 am. So my question is how to reset my sleep cycle, your help will be appreciated thanks.