PARK CITY, Utah—In China, where men now outnumber women by 30 million thanks to the country’s former One Child Policy, finding a wife may not be a no-holds-barred, to-the-death battle royale, but it’s ...

I can’t get my mind to quiet enough for that. The Elemind headband is typically used to facilitate a full night of sleep, but I got to try it out for a 30 minute, mid-afternoon nap.