A third of US adults report that they usually get less than the recommended amount of sleep. Not getting enough sleep is linked with many chronic diseases and conditions—such as type 2 diabetes, heart disease, obesity, and depression—that threaten our nation’s health. Not getting enough sleep can lead to motor vehicle crashes and mistakes at work, which cause a lot of injury and disability each year. Getting enough sleep is not a luxury—it is something people need for good health. Sleep disorders can also increase a person’s risk of health problems. However, these disorders can be diagnosed and treated, bringing relief to those who suffer from them.