Are you sleeping is enough?

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Recently I have began to be a trainee in a IT company. At first, I thought It was so lucky that I was sent to a project in a motor company, but worked for a period, I found so tired because I could not sleeping enough, only less than six hours one day, of cause, maybe you think it is enough, but for me, a person who has to sleep more than seven hours one day, six hours means not having enough sleep, also I have too heavy work during the work-time,mainly I have to face the computer all eight hours, at beginning is ok,but now, I feel a little tired. After all, this is my first job,I don't think workload is too heavy, if you want to the best company, you have to pay for it, even your sleeping time. Do you have the problem of lacking of sleeping time,why?