Research suggests being well rested can make people more valuable at work and better in investing, reports the Wall Street Journal.

For the first time, new research has attempted to put some numbers on the link between more Zzzs and more Benjamins. Matthew Gibson and Jeffrey Shrader, graduate researchers in the economics department of the University of California, San Diego, compared wage data with sleep times recorded in the U.S. Census Bureau’s American Time Use Survey. Their conclusion: For those who are sleeping too little, “a one-hour increase in long-run average sleep increases wages by 16%, equivalent to more than a year of schooling.”