A handful of studies this year have emphasized the importance of getting your eight hours and getting them on a regular schedule.

Sleep deprivation hinders your body's ability to break down sugars as well as your brain's ability to tell when you're full. If you undersleep during the week and try to make up for it on the weekends, you have a higher chance of developing depression and obesity. If you cut your sleep time short and also suffer from insomnia, you're also at a higher risk for high blood pressure. Researchers also found associations between sleep disorders and Alzheimer's, cancer mortality and hyperglycemia—a precursor of type 2 diabetes. Bottom line: Make a resolution to get enough sleep in 2013!

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