It takes a certain mix of optimism and worry to sleep with your phone within arm’s reach. Something might happen—and I might miss it!

Like FOMO (Fear of Missing Out), this is mostly a Millennial concern, and the younger you are, the more likely you are to experience it. However, unlike FOMO, which is more about social anxiety in our always-connected world, this is more about how the always-on generation is changing its approach to balancing work and life.

In 2014, when your phone serves as both the front door to your home and your office mailbox, you’re just as likely to get a midnight text from your girlfriend as you are to receive a midnight email from your boss. Neither will hesitate to contact you, even if you’re in your pajamas, drifting off to sleep.

For baby boomers who grew up with strict 9-to-5 jobs and clear lines between their social and professional lives, this is a drastic shift. To them, a successful career and a successful life are two different things. In the 2014 Allstate-National Journal Heartland Monitor Poll, only 71 percent of baby boomers said that having a successful career is necessary for living a good life, compared to 91 percent of Millennials.

Millennials, it turns out, are okay with this new reality—as long as their employers are willing to meet a few of their demands. And if they aren’t, Millennials, who are about to become the largest group in the U.S. workforce, are willing to look for jobs elsewhere.

Studies consistently show that Millennial workers tend to have low loyalty to their employers, with 60 percent leaving within three years of being hired. At PricewaterhouseCoopers, the accounting giant, the turnover was so noticeable that in 2013, executives launched an investigation to understand what was going on.

One of the findings was that “Millennials do not believe that productivity should be measured by the number of hours worked at the office, but by the output of the work performed. They view work as a ‘thing’ and not a ‘place.’” The long hours and traditional work-life tradeoffs were not working for the company’s younger employees; they wanted more flexibility and sought it elsewhere.

The report also found that Millennials want a workplace where they can connect with like-minded people. As the first always-on generation—always accessible to friends, family, colleagues, and even spammy newsletters—they understand more than anyone that work, being more of a ‘thing’ than a ‘place,’ means you can never really leave it. It’s no surprise that, according to another recent study, 88 percent of Millennials want a “fun and social” workplace—a much higher percentage than the 60 percent of baby boomers who said the same thing. The study also revealed that 71 percent of Millennials want their coworkers to be like a “second family.”

These workplace demands fall under the umbrella of “culture fit,” which Millennials often cite as the main reason for leaving a company.

To them, it seems that if you’re going to deal with the demands of a career in 2014, with your phone on the nightstand ready to jolt you awake to answer a late-night work email, you at least want the person on the other side of that message to be someone you can laugh with about it in the morning.