Hypnagogic hallucination
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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- Hypnic
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.
- Hypnic headache
A relatively rare form of headache disorder in which the patient is awakened from sleep nightly, usually between 1 and 3am, with intense dull or throbbing pain over the whole head. Each episode may last up to 1 hour and be associated with nausea. Similar episodes may occasionally strike in the daytime. Hypnic headache almost […]
- Hypnic jerk
The common normal phenomenon of jerking awake, usually accompanied by a feeling of falling, just as one is drifting off to sleep. Also called a sleep jerk or sleep start.
- Hypnolepsy
A neurological disorder marked by a sudden recurrent uncontrollable compulsion to sleep. Also known as narcolepsy. The disorder is often associated with cataplexy (a sudden loss of muscle tone and paralysis of voluntary muscles associated with a strong emotion), sleep paralysis (immobility of the body that occurs in the transition from sleep to wakefulness), what […]
- Hypnopompic hallucination
A vivid dreamlike hallucination that occurs as one is waking up. The opposite of an hypnagogic hallucination, which occurs as one is falling asleep.