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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.
Falling is one of the most common accidents that cause a loss in the quality of life for older adults, and is usually precipitated by a loss of balance and weakness in the legs. [ 1 ] [ 2 ] The cause of falling in old age is often multifactorial and may require a multidisciplinary approach both to treat any injuries sustained and to prevent ...
When stepping onto the broken escalator, the person will anticipate its movement, just to make sure they would not fall if the escalator were to move. The person undertakes a 'worst-case scenario' which seems the most strategic option: preparing for the platform to move even though it won't is better than the opposite.
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 .
"I did a bunch of 360 flips in the air, upside down, hitting various body parts, trying to arrest myself, but everything was covered in ice," Brooklyn resident Martynka Wawrzyniak recalled.
People often use the simple mnemonic spring forward, fall back to remember to set clocks forward one hour (e.g., from 2 a.m. to 3 a.m.) in the spring and backward one hour (e.g., from 2 a.m. to 1 ...
Suddenly, we were being pelted. A tightly packed swarm of fish, known as a bait ball, started jumping out of the water into our kayak. Their movement sounded like crackling glass all around us.
head banging, where the head is forcibly moved in a back and forth direction. head rolling, where the head is moved laterally while in a supine position. Other less common muscle movements include: body rolling, where the whole body is moved laterally while in a supine position. leg rolling, where one or both legs are moved laterally.