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NHLBI

Circadian Rhythm Disorders – Diagnosis

Sleep-wake cycle disorders 

To diagnose a circadian rhythm disorder, your doctor may review your medical history; ask about your symptoms, sleep patterns, and environment; do a physical exam; and order diagnostic tests.

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NHLBI

Circadian Rhythm Disorders – Signs, Symptoms, and Complications

Sleep-wake cycle disorders 

Signs and symptoms of circadian rhythm disorders can vary depending on the type of circadian rhythm disorder you have and how severe your condition is. Many of the symptoms of circadian rhythm disorders occur because you are not getting enough good-quality sleep when your body needs it. Undiagnosed and untreated circadian rhythm disorders may increase your risk of certain health conditions or cause workplace or road accidents.

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NHLBI

Circadian Rhythm Disorders – Screening and Prevention

Sleep-wake cycle disorders 

Currently, there are no screening methods to determine who will develop circadian rhythm disorders. Your doctor may ask you about your sleep habits in childhood and the last several years, and if you have performed shift-work. If you are at risk for circadian rhythm disorders, your doctor may recommend certain lifestyle changes to help prevent a circadian rhythm disorder.

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NHLBI

Circadian Rhythm Disorders – Risk Factors

Sleep-wake cycle disorders 

You may have a higher risk for circadian rhythm disorders because of internal factors such as your age, your sex, family history and genetics, and certain medical conditions that affect your brain or vision. External factors such as your lifestyle habits, environment, and occupation can also increase your risk.

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NHLBI

Circadian Rhythm Disorders – Causes

Sleep-wake cycle disorders 

Circadian rhythm disorders occur when your sleep-wake cycle is out of sync with your environment. Many factors, both internal and external, can cause you to have problems sleeping and raise your risk for a circadian rhythm disorder.

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NHLBI

Circadian Rhythm Disorders – Types

Sleep-wake cycle disorders 

The types of circadian rhythm disorders are advanced or delayed sleep-wake phase disorder, irregular or non–24-hour sleep-wake rhythm disorder, and shift work or jet lag disorder. The type you may have is based on your pattern of sleep and wakefulness.

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NHLBI

How the Lungs Work - What Breathing Does for the Body

respiratory system 

Breathing involves two phases: breathing in and breathing out. Your lungs deliver oxygen and remove carbon dioxide from your blood in a process called gas exchange. Gas exchange happens in the capillaries surrounding the alveoli, where the oxygen that is breathed in enters the circulatory system and carbon dioxide in the blood is released to the lungs and then breathed out. If you have problems breathing, gas exchange may be impaired, increasing the risk of serious health problems.

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NHLBI

How the Lungs Work - Keeping Your Lungs Healthy

respiratory system 

You can take steps to help protect your lungs from injury or disease, including quitting smoking and avoiding secondhand smoke, aiming for a healthy weight, being physically active, and limiting exposure to air pollution.

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NHLBI

How the Lungs Work - How Your Body Controls Breathing

respiratory system 

The body’s muscles and nervous system help control your breathing. The lungs are like sponges; they cannot move on their own. Muscles in your chest and abdomen contract, or tighten, to create space in your lungs for air to flow in. The muscles then relax, causing the space in the chest to get smaller and squeeze the air back out. Your breathing usually does not require any thought, because it is controlled by the autonomic nervous system, also called the involuntary nervous system.

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NHLBI

How the Lungs Work - The Respiratory System

respiratory system 

The respiratory system helps you breathe. The main parts of the respiratory system are the lungs, the airways, and the muscles that enable breathing. The circulatory system, which is made up of the heart, veins, arteries, and capillaries, brings blood to and from the lungs and delivers nutrients and oxygen to tissues of the body while removing carbon dioxide and waste products. Other body systems that work with the respiratory system include the nervous system, lymph system, and immune system.

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