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Sleep related terms

- H -

  • Habitual Snorers

  • Those who snore nearly every night

  • Heart Rate or beats per minute (bpm)

  • Pace/speed of the heart measured in beats per minute. 60-80 is considered normal in adults.

  • Hertz (Hz)

  • Unit of frequency; equal to cycles per second (cps).

  • Histogram (sleep)

  • Graph indicating sleep stages thoughout the night.

  • Humidification

  • Moisture is added to the airflow as an adjunct to CPAP (Continuous Positive Airway Pressure) therapy in treating obstructive sleep apnea (OSA). Humidification can be added to the CPAP by diverting the airflow over or through a cool or heated water reservoir (humidifier) to prevent the upper airway from drying out.

  • Hyoid Suspension

  • A possible surgical procedure sometimes used in the treatment of sleep apnea and/or snoring, designed to improve the airway behind the base of the tongue. The hyoid bone is located in the neck where some tongue muscles attach. The hyoid bone is pulled forward in front of the voice box and can open the airway space behind the tongue.

  • Hyperactivity

  • Typical behavior in a child with a sleep disorder which is causing lack of quality sleep

  • Hypercapnia

  • Excessive or elevated carbon dioxide in the blood

  • Hyperirritability

  • Extreme irritability; seen in sleep deprived subjects.

  • Hypersomnia

  • Excessive, prolonged sleep

  • Hypertension

  • High blood pressure.

  • Hypnagogic imagery (-hallucinations)

  • Vivid sensory images occurring at sleep onset but particularly vivid with sleep-onset REM periods; feature of narcoleptic REM naps.

  • Hypnagogic startle

  • Sleep start; or sudden body jerk, observed normally just at sleep onset, resulting in at least momentary awakening

  • Hypnophobia

  • Morbid fear of falling asleep.

  • Hypnotics

  • Sleep-inducing drugs.

  • Hypopharynx

  • Lowermost portion of the pharynx leading to the larynx and esophagus.

  • Hypopnea

  • Shallow breathing in which the air flow in and out of the airway is less than half of normal--usually associated with oxygen desaturation.

  • Hypoventilation

  • Reduced rate and depth of breathing.

  • Hypoxemia

  • Abnormal lack of oxygen in the blood in the arteries.

  • Hypoxia

  • Deficiency of oxygen reaching the tissues of the body.

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Sleep Related Terms

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