To see how naps affect academic performances researchers taught 40 pre-schoolers between the ages of 3 and 6 to perform a memory task. After a few hours of break time, the children need their stayed-awake or got to nap, sleeping for an average of 77 minutes. Although napping may no significant difference to feelings and sleepiness, it did help enhance memory. When tested later in the day, students who had rested performed better. Even the next day, the children who had napped after the initial lesson still retained more information. The benefit was greatest for students who took naps regularly, not just during the study, which suggests schools may want to keep sleep on the salivas.