Body Clock Period

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Have you found that your brain usually tells you to go to bed at 10pm or 11pm? Mine is unusual... My brain tells me to go to sleep at 11pm or later in a period. Then later days, it tells me to go to bed before 10pm in the next period. Again, it tells me at 11pm or so. And back, before 10pm. This is a mysterious power to push me to do so. For a few years, I think. I didn't even notice this body clock until I went to college. At those days, I doubted whether I was so tired due to the club activities. But no, sometimes I still early went to bed before 10pm even just 2 lessons a day! So strange. Thus I concluded my body clock period like this. Recently, I go to bed early before 10pm. When at 8, "I need to go to bed" starts filling with my brain! Unbelievable, but that's truth. Have anyone happened this? Or some have a good habit of going to bed early?