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While it's unlikely that you will die from a lack of sleep, the condition can cause serious problems over time. It also raises your risk for heart attack, stroke and other health issues that may require medical treatment. Getting enough sleep improves your immune system, hormone regulation, metabolic function and blood pressure control. It's also crucial for memory and cognitive functions. Symptoms...

Sleep deprivation can mess with your mind and body in some serious ways. Researchers have found that you can become sluggish and prone to mistakes after just a few days without sleep. In 1940s Soviet Russia, scientists created a stimulant they believed could remove the need for human sleep. They tested it on five prisoners, promising them freedom. The results were horrifying....

REM sleep is the fourth stage of sleep. You go through four or five REM cycles each night. Each cycle lasts about 90-120 minutes. During REM sleep, skeletal muscles are temporarily paralyzed to allow you to dream. This is called muscle atonia. Isolated RBD is associated with issues in the part of the brainstem called the pons, which controls muscle atonia. It’s...