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Heavy-headedness is the feeling of faintness, dizziness, or feeling of floating, wooziness. [1] [2] [3] Individuals may feel as though their head is heavy; also feel as though the room is moving/spinning also known as vertigo.
A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.
The spins (as in having "the spins") [1] is an adverse reaction of intoxication that causes a state of vertigo and nausea, [2] causing one to feel as if "spinning out of control", [3] especially when lying down. It is most commonly associated with drunkenness [4] or mixing alcohol with other psychoactive drugs [5] such as cannabis.
Looking at or through a slowly spinning propeller [4] According to The US Naval Flight Surgeons Manual, flicker vertigo is a rare occurrence. [5] Flicker vertigo has been considered as a principle for various forms of non-lethal weapons.
Vertiginous epilepsy is infrequently the first symptom of a seizure, characterized by a feeling of vertigo.When it occurs, there is a sensation of rotation or movement that lasts for a few seconds before full seizure activity.
A sensation of falling occurs when the labyrinth or vestibular apparatus, a system of fluid-filled passages in the inner ear, detects changes in acceleration.This sensation can occur when a person begins to fall, which in terms of mechanics amounts to a sudden acceleration increase from zero to roughly 9.81 m/s 2.
Motion sickness occurs due to a difference between actual and expected motion. [1] [2] [4] Symptoms commonly include nausea, vomiting, cold sweat, headache, dizziness, tiredness, loss of appetite, and increased salivation.
A video of a man walking in an Ames room. An Ames room is viewed with one eye through a peephole.Through the peephole, the room appears to be an ordinary rectangular cuboid, with a back wall that is vertical and at right angles to the observer's line of sight, two vertical side walls parallel to each other, and a horizontal floor and ceiling.