If you've ever spent a restless night flipping around in bed, you already know how weary, grumpy, and out of sorts you'll feel the next day. However, not getting the recommended 7 to 9 hours of sleep each night does more than make you sluggish and irritable. Sleep deprivation has long-term consequences. It depletes your mental capacities and jeopardizes your physical health. Sleep deprivation has been related to a variety of health issues, ranging from weight gain to a compromised immune system. Continue reading to learn more about the causes of sleep deprivation and how it affects various body processes and systems.