To understand sleep deficiency, it helps to understand how sleep works and why it's important. The two basic types of sleep are rapid eye movement (REM) and non-REM.
Non-REM sleep includes what is commonly known as deep sleep or slow wave sleep. Dreaming typically occurs during REM sleep. Generally, non-REM and REM sleep occur in a regular pattern of 3–5 cycles each night.
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You have an internal "body clock" that controls when you're awake and when your body is ready for sleep. This clock typically follows a 24-hour repeating rhythm (called the circadian rhythm). The rhythm affects every cell, tissue, and organ in your body and how they work.
If you aren't getting enough sleep, are sleeping at the wrong times, or have poor quality sleep, you'll likely feel very tired during the day. You may not feel refreshed and alert when you wake up.
Sleep deficiency can interfere with work, school, driving, and social functioning. You might have trouble learning, focusing, and reacting. Also, you might find it hard to judge other people's emotions and reactions. Sleep deficiency also can make you feel frustrated, cranky, or worried in social situations.
The signs and symptoms of sleep deficiency may differ between children and adults. Children who are sleep deficient might be overly active and have problems paying attention. They also might misbehave, and their school performance can suffer.
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