Sleep Disorders and Insufficient Sleep - Research findings

Sleep Disorders are associated with a growing number of health conditions - insulin resistance and diabetes, blood pressure, heart diseases, cancer, obesity, stroke 

Sleeping less than 7-8 hours each night, irregular sleep schedules, poor sleep quality increase health risks.

http://www.nhlbi.nih.gov/news/spotlight/fact-sheet/sleep-disorders-insufficient-sleep-improving-health-through-research