Deena Shanker, writing for Bloomberg: If you pull out your phone to check Twitter while waiting for the light to change, or read e-mails while brushing your teeth, you might be what the American Psychological Association calls a "constant checker." And chances are, it's hurting your mental health. Last week, the APA released a study finding that Americans were experiencing the first statistically significant stress increase in the survey's 10-year history. In January, 57 percent of respondents of all political stripes said the U.S. political climate was a very or somewhat significant source of stress, up from 52 percent who said the same thing in August. On Thursday, the APA released the second part of its 1 findings, "Stress In America: Coping With Change," examining the role technology and social media play in American stress levels. [...] The highest stress levels, it should be noted, are reserved for those who constantly check their work e-mail on days off. Their average stress level is 6.0. So those of you who think it's somehow pleasant to work from home on a Saturday afternoon, you're actually fooling yourself.