Sleep deprivation is a widespread phenomenon in this country. I see a number of people who are tired and hope that some thyroid hormone will make them feel better. When fatigue, forgetfulness and inability to concentrate is caused by sleep deprivation there is no medication that will correct these symptoms, except maybe a sleeping pill.
Beyond daily dysfunction, sleep deprivation as well as excessive sleep is associated with systemic inflammation and heart disease. If you are chronically sleeping too little or too much discuss your health status with your primary care physician.