If your boss calls you on the weekend, that's job spill. If you boot up your laptop after supper — job spill.

According to Fraser and the dozens of workers she spent four years interviewing, this so-called "job spill" — this seamless merging of home and work that was supposed to make our lives so much easier — is the bane of today's mid-level corporate worker. It's everywhere.

Job spill … is the dirty little secret behind many a corporation's thriving bottom line.