Hypnic jerks, also known as hypnagogic jerks, are a common phenomenon in which people experience jolts when dozing off or waking up.

hypnic-jerks

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National Institute of Neurological Disorders and Stroke

Sleep Medicine

Journal of Neurosciences in Rural Practice

Current Sleep Medicine Reports

Mayo Clinic Proceedings

Therapeutic Advances in Neurological Disorders

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<div class="" data-block="true" data-editor="flt2j" data-offset-key="1f4pr-0-0"><span data-offset-key="1jrak-0-0"><span data-text="true">The brain is at the center of our nervous system. It sits atop our heads, where it sends and receives important messages. These messages travel through our nerves and inform our actions. </span></span><span class="adverb"><span data-offset-key="1jrak-1-0"><span data-text="true">Conversely</span></span></span><span data-offset-key="1jrak-2-0"><span data-text="true">, our brains also react to neural messages that it receives from our nerves. These neurons communicate quickly back and forth. </span></span><span class="hardreadability"><span data-offset-key="1jrak-3-0"><span data-text="true">When our fingertips graze over something hot, our brain gets the information </span></span></span><span class="adverb"><span data-offset-key="1jrak-4-0"><span data-text="true">instantly</span></span></span><span class="hardreadability"><span data-offset-key="1jrak-5-0"><span data-text="true"> and tell us to pull our hand away</span></span></span><span data-offset-key="1jrak-6-0"><span data-text="true">. The brain and the nerves work together </span></span><span class="adverb"><span data-offset-key="1jrak-7-0"><span data-text="true">constantly</span></span></span><span data-offset-key="1jrak-8-0"><span data-text="true"> to keep us in check.</span></span></div>
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<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="arolf-0-0"><span data-offset-key="arolf-0-0"><span data-text="true">Anything that seems instinctual or automatic is due to the nervous system. When we right ourselves after a moment of falling, this is due to the cerebellum. When </span></span><span class="qualifier"><span data-offset-key="arolf-1-0"><span data-text="true">we feel</span></span></span><span data-offset-key="arolf-2-0"><span data-text="true"> hunger or thirst after a while of fasting, this is due to the hypothalamus. Or when </span></span><span class="qualifier"><span data-offset-key="arolf-3-0"><span data-text="true">we feel</span></span></span><span data-offset-key="arolf-4-0"><span data-text="true"> the sudden urge to run away during stressful situations, this is due to the amygdala.</span></span></div>
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<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="5mlm9-0-0"><span class="hardreadability"><span data-offset-key="5mlm9-0-0"><span data-text="true">The main route that nerves travel down, before branching off to their repsective body parts, is the spinal cord</span></span></span><span data-offset-key="5mlm9-1-0"><span data-text="true">. The spinal cord extends from the brain down to the tail bone. Though it is a bundle of nervous, many nerves branch off and continue along to places like our arms and legs. </span></span></div>
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Anatomy

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<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="1smsj-0-0"><span data-offset-key="1smsj-0-0">Anatomy is a branch of biology. This branch of science in particular deals with organisms and their biological structure. Human anatomy, along with physiology and biochemistry, forms the basis of medicine.</span></div>
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<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="8jihb-0-0"><span data-offset-key="8jihb-0-0">Some parts that make up the body's structure are </span><span class="adverb"><span data-offset-key="8jihb-1-0">incredibly</span></span><span data-offset-key="8jihb-2-0"> complex. Take the circulatory system, for example, which contains the heart and blood vessels. This system </span><span class="complexword"><span data-offset-key="8jihb-3-0">handles a lot of responsibility.</span></span><span data-offset-key="8jihb-4-0"> many crucial functions. It transports blood, nutrients, waste products, immune cells, and clotting cells. It is also </span><span class="adverb"><span data-offset-key="8jihb-5-0">closely</span></span><span data-offset-key="8jihb-6-0"> tied to the lymphatic system and our immune system. </span></div>
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<div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="8jihb-0-0"><span data-offset-key="8jihb-6-0">As you can see, no one part of our anatomy functions completely separate from the others. </span>All the parts of the structure must get along in order for the body to function.</div>
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Nervous System

What Are Hypnic Jerks and How Can They Affect Sleep?

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