One survey finds that dress codes have been relaxed so much that employees don't know what to wear anymore. More than 40 percent say they wear jeans or whatever is most comfortable to the office. But most still think how they dress affects their performance reviews. And all this can be a bigger problem than "what will I wear?" A study on "workplace taboos" finds employees may be getting a little too comfortable. About 45 percent of workers admitted to falling asleep on the job, and 21 percent admitted to drinking alcohol while at work.