Video: A sleep expert explains why you need treatment for insomnia

Tossing and turning. Trouble falling asleep. Trouble staying asleep. Insomnia isn't only frustrating; it can also affect your health.

Learn why Mayo Clinic sleep expert Timothy I. Morgenthaler, M.D., says it's important to tell your doctor if you have sleepless nights. Plus: He offers "good news" about getting back on track.