Sleeping 8 hours is recommended in order to feel well-rested, but for some people that 8 hours is just not enough. If you are left feeling constantly tired through the day, it may be because you are not getting the right quality of sleep. Restless sleep has been linked to such issues as ADD/ADHD, obesity, and sleep apnea. It contributes to an overall inability to focus, feelings of stress and overall exhaustion.