“Scientists are finding the old-fashioned nap can be a boon to productivity,” reports Australia’s Sydney Morning Herald. However, the length of time spent napping is important. After testing naps of varying lengths, Flinders University sleep expert Professor Leon Lack stated: “One minute of sleep seemed to produce no benefit whatsoever. Five minutes of sleep seemed to produce benefits for some people but not very dramatic ones. However, 10 minutes of sleep seemed to produce significant improvements in virtually all the measures we had.” In contrast, people dozing for longer periods—up to 30 minutes—reported feeling tired for up to an hour afterward.