Are you ever feeling that you must go sleep but you could not ?

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the night is long ,and it strikes 12'colock .your eyes are still open .your mind is yet clear,your heart is abit of confusing . you must be sleeping when yesterday,you must be having a sweet dream.you maybe have a date with Mr Zhou.but now you are still keep a clear mind ,your roomrats are going to bed .what are you doing so as to kill the time without disturbing them ? gazed at the wall.counting the goats?so how slow the time is ! how tiresome it is!