There are two types of sleep apnea:

obstructive sleep apnea (the most common type) and
central sleep apnea.

Sleep apnea can be caused by many factors such as strokes, heart failure, medications, or physical structures in the throat and mouth. Treatment range from medical devices to surgery.

Read the Obstructive and Central Sleep Apnea Main Article

Doctor's Notes on Obstructive and Central Sleep Apnea Symptoms

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Heart Rhythm Disorders

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Atrial Fibrillation

Atrial fibrillation (AFib) describes a rapid, irregular heart rhythm. The irregular rhythm, or arrhythmia, results from abnormal electrical impulses in the heart. Atrial fibrillation may be treated with medications or surgery. There are many causes of atrial fibrillation, for example, pneumonia, heart disease, alcohol use, and thyroid problems. Symptoms of atrial fibrillation include chest pain and/or angina, nausea, dizziness, and heart palpitations. Atrial fibrillation is managed and treated with medication, medical procedures, and surgery.
High Blood Pressure

High blood pressure (hypertension) may be present in an individual, without any symptoms. Thus, it is called the "silent killer." Causes of high blood pressure include heart disease, kidney disease, tumors, birth control, alcohol, thyroid dysfunction, and birth control pills.Treatment of high blood pressure is generally through diet, exercise, and medication if necessary.
Polycythemia (High Red Blood Cell Count)

Polycythemia (high red blood cell count) is a condition in which there is an increased number of red blood cells in the blood. There are two types of polycythemia; 1) primary polycythemia and 2) secondary polycythemia. The two main conditions of primary polycythemia are polycythemia vera (PV) and primary familial and congenital polycythemia (PFCP). Causes of secondary polycythemia include conditions as a result of chronic hypoxia such as COPD, emphysema, chronic bronchitis, pulmonary hypertension, congestive heart failure, obstructive sleep apnea, and certain cancers. Examples of symptoms of polycythemia include easy bruising or bleeding, blood clot formation, headache, itching, and fatigue. Treatment for polycythemia depends on the cause. Untreated polycythemia generally has a poor outcome for the patient.
Insomnia

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Obesity

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Pulmonary Hypertension

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Sleep is defined as a state of unconsciousness from which a person can be aroused. In this state, the brain is relatively more responsive to internal stimuli than external stimuli. Sleep deprivation has many deleterious effects on the body. Sleep apnea and sleep paralysis are two common kinds of sleep disorders. Several activities can help one to fall asleep fast.
Sleep Disorders and Aging

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Sleep Disorders in Women

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Sleeplessness and Circadian Rhythm Disorder

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High Blood Pressure High blood pressure (hypertension) may be present in an individual, without any symptoms. Thus, it is called the "silent killer." Causes of high blood pressure include heart disease, kidney disease, tumors, birth control, alcohol, thyroid dysfunction, and birth control pills.Treatment of high blood pressure is generally through diet, exercise, and medication if necessary.