Doctors will tell you that proper rest is the key to good health and a long life. We’ve always been told we should try to sleep eight hours nightly. But many of us know that getting the proper rest is nearly impossible. Doctors and researchers say that our realistic goal should be somewhere between six to nine hours. They also say that while too little sleep can shorten your life, getting too much over 9 hours a night can also be harmful. Catching up on sleep is a myth. While getting the proper amount of rest is a challenge for many, experts suggest we do a better job of getting adequate rest…