There’s nothing like waking up after a good night of sleep, feeling well-rested and ready for the day. Unfortunately, that’s apparently not happening for one-third of U.S. adults, who report that they wake up after less than the recommended amount of sleep, according to Centers for...

You rely on concentration to get through work or school every day. When you're unable to concentrate, you can't think clearly, focus on a task, or maintain your attention. Your performance at work or school could be affected if you can't concentrate. You may also find...