how to sleep soundly?

China
March 16, 2007 7:57pm CST
I do not clearly know why these days i can not sleep well.I sleep so late in the evening and wake up early moring.Someone say if you are under great stress you can not sleep soundly.But i do not have any pressure on my study or on my life.What's going on with my body?How to go back what i am used to ?Do you have any good suggestion for me?
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