Sick of round-the-clock work emails and Slack messages? Here's some hope. By Dr. Newport is the author of "Digital Minimalism: Choosing a Focused Life in a Noisy World." A German entrepreneur named Lasse Rheingans has become a subject of attention since The Wall Street Journal recently reported on a novel idea he has put in place at his 16-person technology start-up: a five-hour workday.

Opinion | 5-Hour Workdays? 4-Day Workweeks? Yes, Please