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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.
But that's the point of funny jokes and corny puns: to give you a chuckle despite how utterly cheesy they are. In fact, that's what makes them so, well , grate.
Two new studies indicate the importance of getting a good night's sleep — with one study saying a lack of sleep may be sabotaging the brain’s ability to keep intrusive thoughts at bay.
Bend both knees to lower your body until your back knee is close to touching the floor. Keep your upper body upright and your front knee aligned over your ankle. Avoid letting your knee cave inward.
Schematic representation of patellar tendon reflex (knee jerk) pathway. The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord. Many animals, most significantly humans, have been seen to have the patellar reflex, including dogs, cats, horses, and other ...
Cataplexy is the first symptom to appear in about 10% of cases of narcolepsy, [2] caused by an autoimmune destruction of hypothalamic neurons that produce the neuropeptide hypocretin (also called orexin), which regulates arousal and has a role in stabilization of the transition between wake and sleep states. [3]
Knee pain can be debilitating, making simple tasks like walking, climbing stairs, or even standing up a painful experience. For many, the quick fix seems to be a cortisone shot - an anti ...
This system enables people to keep their balance by signalling when a physical correction is necessary. Some medical conditions, known as balance disorders, also induce the sensation of falling. In the early stages of sleep, a falling sensation may be perceived in connection with a hypnic jerk, sometimes awaking the sleeper abruptly.