Hyperventilation
Overbreathing. Hyperventilation causes dizziness, lightheadedness, a sense of unsteadiness, and tingling around the mouth and fingertips. Hyperventilation can be severe enough to mimic the early warning symptoms of a heart attack, and is therefore a common cause of emergency room visits in the US. Hyperventilation is common and normal after aerobic exercise. Hyperventilation can be caused by serious diseases of metabolism and anxiety. Relief for hyperventilation caused by anxiety can be achieved by breathing in and out of a paper bag to increase the level of carbon dioxide in the blood.
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Concerning the drowsiness one commonly feels before sleep, the transitional state preceding sleep, and also the hallucinations that may occur at that time. The original French word “hypnagogique” was derived from Greek roots “hypno-“, sleep + “agogos”, leading = leading to sleep. In the 19th century “hypnagogique” came across the English Channel and became “hypnagogic.” […]
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A vivid dreamlike hallucination that occurs as one is falling asleep. The opposite of an hypnopompic hallucination which is a vivid dreamlike hallucination that occurs as one is waking up.
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1. Inducing sleep. 2. Pertaining to sleep. A hypnic jerk is a sleep start or jerk. From the Greek hypnikos, from the Greek hypnos, sleep.
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