How will you know if you are already working too hard?

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I have a lot of things to do in the office these days especially when since I got promoted last month. It's hard to refuse a position that you worked hard for and never expected to have in the end. I go to work everyday except during weekends. Sometimes, I already lack sleep because I need to do some reports which are already due some time next week. There are also times when I stay in the office and spend the night there just to make sure that everything will be fine the following day. I'm a workaholic but my co-workers are too. I want to know how will you know if you are overworked already...^^