Sara Mednick, an associate professor of cognitive sciences at the University of California, Irvine, is one of many sleep researchers who have demonstrated that naps improve our memories, make us more creative and less anxious, prevent mistakes and help us retain more of what we learn. … So, a quick nap at work “is a great idea,” according to Mednick. “It’s so much healthier than caffeine. It’s so much better for people,” she said.