It provides the basis for certain identifications, such as the medieval one: the cave referred to the human heart as the spiritual "center." The cave, in this case, represents the unconscious, your subjective world, the experiences and knowledge accumulated over the years. All this allows you to reach maturity. It is very common dream during adolescence. The events happening inside the cave will reveal which aspects of the Self you are working on. In other interpretations, the cave represents the womb or female sexuality. What you find in it will be those elements the unconscious wants to cultivate in your: virtues, ideas, attitudes, etc. Many dragons and monsters from mythology lived in caves guarding a great treasure. This symbolizes that before winning the spiritual reward, you must fight the unconscious' fears. The cavern may also represent memories about a traumatic childhood that have been banished from conscious memory.
In most kids, lack of sleep can surely result to ADHD (Attention Deficit Hyperactivity Disorder), which is the opposite with the adults. Children between 7 and 10 who gets less than 8-hours of sleep every night will likely to become inattentive, impulsive and hyperactive. Their sleeping patterns can easily affect their brain.
Improving memory can be done in a number of ways, and one of those is by having a good night's sleep. During sleep, your mind is still busy and going through the process of consolidation, where it strengthen your memories as well as the "practice" skills, which you have learned while you're awake. According to the associate professor at NYU Langone Medical Center, Dr. Rapoport says that something happens while we are all sleeping, and it helps us learn things better. Thus, if you're trying something new, you can perform it better right after you sleep.