essential for runners because this is when your body regenerates. If you're having trouble sleeping, your running routine could be the cause. Running triggers conditions in your body that can interfere with sleep. Additionally, the intensity of your workout and the length of time you run can also affect your sleep cycle. Learning more about the effects of running on sleep can help you get the seven to nine hours of sleep recommended by experts. (See References 1) Increased Cortisol When you wake up in the morning, the amount of cortisol, the stress hormone, in your body is at its highest, and over the course of the day it slowly decreases. In addition to suppressing your immune system, increasing your blood sugar, and promoting the metabolism of carbohydrates, proteins, and fats, cortisol increases glucose in your body when you run. Glucose, in turn, provides energy to your muscles. After you finish your workout, cortisol levels can remain elevated for up to nine hours, which can negatively affect sleep. (See references 2 and 3) Increased body temperature. It's easier to fall asleep in cool conditions....