Once upon a time, a family's biggest technological nuisance was the phone ringing during dinner or late at night. Twenty-four hour TV programming, the Internet and cell phones didn't permeate the inner sanctum of the home. School stayed at school, work stayed at work, and those boundaries weren't crossed except in an emergency.
That was then; this is now. For adults, work doesn't end just because you leave the office; in fact, companies equip their people with smart phones and laptops so employees are accessible 24/7. Physicians are used to getting emergency calls, but now there are insurance emergencies, technology emergencies, sales emergencies, accounting emergencies and the list continues.
Likewise, schools send out e-mails – announcements about homework and events -- so kids are getting "business" as well as social messages when they're at home.
Once the walls between home and the outside world come down, it's hard to build them back up again. But, you can make it better. It goes back to setting limits; your child's social life won't implode if she doesn't answer 50 texts that night. Also, minimize the double standard. If you limit screen time for kids, do the same for yourself. You don't want to lose your job over it, but consider how much work you do at home because you "have to" versus what you do because you can and your computer's right there.