(For more information, go to 'What Makes You Sleep?') The rhythm affects every cell, tissue, and organ in your body and how they work. This clock typically follows a 24-hour repeating rhythm (called the circadian rhythm). You have an internal 'body clock' that controls when you're awake and when your body is ready for sleep. It also depends on whether you're sleeping at a time when your body is prepared and ready to sleep. Your ability to function and feel well while you're awake depends on whether you're getting enough total sleep and enough of each type of sleep. Generally, non-REM and REM sleep occur in a regular pattern of 3–5 cycles each night. Dreaming typically occurs during REM sleep. Non-REM sleep includes what is commonly known as deep sleep or slow wave sleep. The two basic types of sleep are rapid eye movement (REM) and non-REM. To understand sleep deficiency, it helps to understand how sleep works and why it's important. Sleep deficiency can lead to physical and mental health problems, injuries, loss of productivity, and even a greater risk of death. Like these other needs, sleeping is a vital part of the foundation for good health and well-being throughout your lifetime. Sleeping is a basic human need, like eating, drinking, and breathing. This article focuses on sleep deficiency, unless otherwise noted. You have a sleep disorder that prevents you from getting enough sleep or causes poor quality sleep.You don't sleep well or get all of the different types of sleep that your body needs.You sleep at the wrong time of day (that is, you're out of sync with your body's natural clock).You don't get enough sleep (sleep deprivation).It occurs if you have one or more of the following:

Sleep deprivation (DEP-rih-VA-shun) is a condition that occurs if you don't get enough sleep.

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