Wakeful exercises for the brain are great and necessary to help improve brain function so you can get smarter. But what about sleep? Not a whole lot is known about sleep, but we know now that scientists were wrong for years with the belief that the brain simply shut down during sleep to recharge. Research now indicates that the brain may actually do a little nighttime filing during sleep. The information from the previous day is catalogued and put in the proper mental folders so it can make the journey from short-term memory to long-term. Sleeping problems have been known to exacerbate other brain issues, so it makes sense that a good night's sleep can help increase the brain's function and ability to focus. It varies from person to person, but between six and eight hours of sleep for adults is generally recommended.