sleepping too short is not good for our health ?

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hi friend : i have some problem thoes days , i always sleep at 2:00 am and get up at 9:00 , i sleep so late because of my work , i start to work at 10:00 after work i must go on working , because i have many work to do , i can not finish it on time , so i must use the after working time to do it , i aslo feel tired those days , i want to finish it quickly , but it does not so easy , i must talk with foreign , the time is not the same as their place ,so i must talk with them with their time, but it is too late at our place , it is the problem that i aslo sleep so late . i am working with ebay , and i must reply the e-mail on time , when someone have problem with it . even so , i like the jib very much , it is one year snice i realize ebay , it is very good for our lives, friend. what is your job, can we share it ? let us go ,^_^