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2. Obstructive sleep apnea - Wikipedia

   en.wikipedia.org/wiki/Obstructive_sleep_apnea

   The patient's blood-oxygen saturation gradually falls until cessation of sleep noises, signifying total airway obstruction of airflow, which may last for several minutes. Eventually, the patient must at least partially awaken from deep sleep into light sleep, automatically regaining general muscle tone.

3. Polysomnography - Wikipedia

   en.wikipedia.org/wiki/Polysomnography

   Polysomnography (PSG) is a multi-parameter type of sleep study [1] and a diagnostic tool in sleep medicine.The test result is called a polysomnogram, also abbreviated PSG.The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").

4. Paroxysmal nocturnal dyspnoea - Wikipedia

   en.wikipedia.org/wiki/Paroxysmal_nocturnal_dyspnoea

   Paroxysmal nocturnal dyspnea is a serious medical symptom that can develop into worsening conditions. Many tests can be done in order to evaluate the cause of paroxysmal nocturnal dyspnea. Because it is commonly associated with heart failure, tests that may be run mainly focus on measuring the function and capability of the heart.

5. Pulse oximetry - Wikipedia

   en.wikipedia.org/wiki/Pulse_oximetry

   A pulse oximeter probe applied to a person's finger. A pulse oximeter is a medical device that indirectly monitors the oxygen saturation of a patient's blood (as opposed to measuring oxygen saturation directly through a blood sample) and changes in blood volume in the skin, producing a photoplethysmogram that may be further processed into other measurements. [4]

6. Respiratory disturbance index - Wikipedia

   en.wikipedia.org/wiki/Respiratory_disturbance_index

   The respiratory disturbance index (RDI)—or respiratory distress Index—is a formula used in reporting polysomnography (sleep study) findings. Like the apnea-hypopnea index (AHI), it reports on respiratory distress events during sleep, but unlike the AHI, it also includes respiratory-effort related arousals (RERAs). [1]

7. 10 Tips to Increase REM Sleep Naturally - AOL

   www.aol.com/10-tips-increase-rem-sleep-115700126...

   Most adults who sleep the recommended seven to nine hours a night get roughly one to two hours of REM sleep. So, REM sleep should account for about 25 percent of your total sleep time.