Concussion is usually defined as “temporary dysfunction of the central nervous system”, which is generally a brief loss of consciousness followed by wakefulness after a mildly violent blow to the head, with no significant changes in the pathological anatomy of the nervous system and no organic damage, and it shows transient neurological changes that may be related to pathophysiological changes caused by violent blows to brain tissue. What activities can and cannot be done during the rest period? How long is enough rest? Cognitive rest after a concussion is becoming more common, but until now, there has not been much data to prove whether it really works. One prospective cohort study showed that children who were tracked after a sports concussion recovered in half the time it took to get good rest after a concussion than concussion patients who used their brains directly. Why is this so? ATP is used to restore balance in the body, but after an injury, blood flow to the brain is slow, increasing ATP healing and decreasing ATP supply are not matched, and cognition – thinking or focusing on certain things behaviorally – uses up a lot of ATP.This means that when kids are still symptomatic about 1-3 weeks after a concussion, it is not right for them to study hard or take tests during this period. They may be very unhappy not to do these things: texting friends and playing video games. Looking at screens during breaks is allowed because it is unlikely to damage treatment, but a little boredom is better. The American Academy of Pediatrics reports that most people with concussions recover from their injuries within 3 weeks, but the length of time off may vary depending on the child’s symptoms.