According to the National Sleep Foundation, 13% of U.S. adults were reported to sleep 6 hours or less per weeknight in 2001. Eight years later, the number increased to 20%. Also, the proportion of people experiencing a sleep problem (e.g. difficulties in initiating or maintaining sleep) several nights per week has increased dramatically (from 51% to 64% in 2001 to 2009). Getting enough and good quality sleep is essential to health. Indices of sleep, including duration, quality, and patterning are related to obesity, type 2 diabetes, cardiovascular disease, hypertension, worsen lipid-lipoprotein status, and premature death. All of these morbidities and mortality are also impacted by diet .