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Habitual Snorers - Individuals who snore nearly every night.
Heart Rate or beats per minute (bpm) - Pace or speed of the heart measured in beats per minute; 60-80 is generally considered normal. Heart rate is continuously monitored in both diagnostic sleep studies and CPAP titration studies.
Hertz (Hz) - A unit of frequency measuring cycles per second (cps). A measurement used in describing sleep EEG brain waves.
Histogram - A graph showing frequency distributions.
Humidification - Adding moisture to the airflow as an adjunct to CPAP (Continuous Positive Airway Pressure) therapy in the treatment of obstructive sleep apnea (OSA). Humidification is added to the CPAP device by diverting the airflow over a cool or heated water reservoir (humidifier) to prevent the upper airway from drying out.
Hyoid Suspension - Surgical procedure sometimes used in the treatment of sleep apnea or snoring. It is designed to improve the airway behind the base of the tongue. The hyoid bone is located in the neck where some tongue muscles attach. If the hyoid bone containing these muscles is pulled forward in front of the voice box, it can open the airway space behind the tongue. This is performed under local intravenous sedation or general anesthesia, and requires a one or two day hospital stay.
Hypercapnia - An excess of carbon dioxide in the blood.
Hyperirritability - Extreme irritability; often seen in sleep deprived subjects.
Hypersomnia - Sleeping for uncharacteristically long periods of time.
Hypersomnolence - Excessive daytime sleepiness.
Hypertension - High blood pressure.
Hypnic Jerk - Sensation of falling, and then "jerking" awake just as one drifts to sleep. It is a normal sensation experienced by many people.
Hypnophobia - Morbid fear of falling asleep.
Hypnotics - Sleep-inducing medications; sleeping pills.
Hypopharynx - The lowermost portion of the pharynx leading to the larynx and esophagus.
Hypopnea - An episode of diminished breathing during sleep, caused by a partial airway obstruction, and resulting in arousal. Usually accompanied by oxygen desaturation. Hypopneas may be just as serious as apneas and have the same troublesome effects.
Hypoventilation - Reduced rate and depth of breathing.
Hypoxemia - Lack of an adequate amount of oxygen in the blood.
Hypoxia - A deficiency of oxygen reaching the tissues of the body.
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