As the NBA and NHL playoffs start, a Harvard sleep specialist advises rest, not more practice, for championship teams. Charles Czeisler, the Frank Baldino, Jr., Ph.D. Professor of Sleep Medicine at Brigham and Women’s Hospital, is profiled. Research by Robert Stickgold, associate professor of psychiatry, and Erin Wamsley, instructor in psychiatry, both of Beth Israel Deaconess Medical Center, is also cited.