How much Japanese employees would be willing to forget to enjoy a healthier balance between work and life?

Companies from Goldman Sachs Group Inc. to Monsanto Co. have become more versatile in their work. You can quickly tap away from a living room couch, the bleachers at the soccer game of your son or huddled over a coconut on your Christmas holiday thanks to smartphones and gadgets. To women, however, there's a hidden cost to all of this— and it's not just the promise of being available 24/7.

A recent International Monetar....