You already know this but we'll say it again: Getting enough sleep is critical for health and well-being. The National Institute of Health pulls no punches when explaining the fallout that can occur when you continually fall short: “Ongoing sleep deficiency is linked to an increased risk of heart disease, kidney disease, high blood pressure, diabetes, and stroke. Plus, sleep is also the time when the energy-boosting hormone testosterone is made. “The number one symptom of low testosterone is low energy,” explains Dr. Fisch. And since testosterone is made when you sleep it's crucial to get 7-9 hours a night. To improve your sleep regimen, try reading instead of watching TV before bed, and try to hit the hay at the same time every night—even on the weekends.