By some accounts, the average professional spends as many as 13 hours checking email each week – almost twice the time we spend reading. Or relaxing. Or socializing, even.

Those misplaced priorities may, alas, be catching up with us: Per a new study by researchers at the University of British Columbia, spending so much time on email is stressing us out – to our enormous detriment.

In fact, in a two-week experiment, the researchers found checking email less at work makes people feel less stressed and that feeling less-stressed correlates with a whole lot of other good things, including productivity, sleep quality – even the feeling that life has meaning.

These connections aren’t new, of course – productivity gurus and overworked office drones have complained about the horrors of email for years.

Tim Ferriss, the self-help virtuoso/obnoxiously perfect human, has ordered his adherents to forsake email all together, save for a few minutes in the morning or late afternoon. In a popular 2011 manifesto, TED’s curator Chris Anderson described email overload as a tragedy of the commons and proposed a “charter” to encourage people to email less.

To come to these conclusions, researchers put together a pretty simple experiment. For one week, they asked a group of 124 email-users to keep their inboxes open the whole workday and check them as often as they could. Then, for the second week, they told their subjects to keep their inboxes closed, turn off email notifications on their phones and only check email three times during their work hours.

During both weeks, the researchers sent participants daily questionnaires about things, like how much work they got done, how they slept and how stressed or nervous they felt.

Overwhelmingly, people answered the same way: When they checked their email all the time, they felt stressed. And when they only checked it three times a day, their stress levels decreased – proof, perhaps, that email has truly become “a giant rats nest of voracious demands on our time, energy and sanity,” as Anderson has said.

That sanity bit is important, it turns out. The researchers also found constant emailing has subtle, downstream consequences that go far beyond topics of productivity and workplace tension.

That’s because the stress that’s caused by email causes changes of its own: how you sleep, how you interact with other people, how meaningful and fulfilling everything feels. In fact, this particular study linked daytime stress to a basket of 10 other things, including affect, sleep quality, mindfulness, productivity, social connectedness and “meaning in life.”

Translation? Checking your email less means less stress, which means happier mood/better sleep/more meaning.

We shouldn’t oversell the findings here, of course: Logging out of Outlook for a few hours isn’t going to revolutionize your life.

But it should be very clear that email, once just another form of communication, has come to represent far more to us, socially and psychologically: It’s a huge, exhausting, Sisyphean task, with surprisingly deep impacts on how we work and what we think.