To see how naps effect academic performance, researchers taught 40 pre-scholars between the age of three to six to perform a memory task.  After a few hours of break time, the children either stayed awake or got to nap, sleeping for average of 77 minutes. Although napping makes no difference to feeling sleepiness, it did enhance memory. When tested later in the day, students who had rested performed better. Even the next day, students who napped at the initial lesson still retained more information. The benefit was greatest  for students who take naps regularly, not just in studying, which suggests schools may want to keep more school on the syllabus.