Tag: Signals

Motion Sickness in Children

Children usually feel sick in the stomach when travelling in a car, airplane, boat or train. This sickness is known as motion sickness. This sickness is caused by reception of wrong signals by eyes, muscles, skin receptors, and inner ears.

While travelling, different body parts send different signals to the brain. Eyes see things around and it sends signals about the direction of movement while in motion. The joint sensory receptors and muscles send signals about the movement of the muscles and the position in which the body is. The skin receptors send signals about the parts of the body which are in contact with the ground. The inner ears have a fluid in the semicircular canals. This fluid senses motion and the direction of motion like forward, backward, up, down, circular, or to and fro. When the brain gets timely reports from the various body parts, it tries to find a relation between all the signals and then sketches a picture about the bodys movement and position at a particular instant. But when the brain isnt able to find a link and isnt able to draw a picture out of the received signals, the condition called motion sickness is experienced.

For example, if a child is riding in a car and reading something at the same time, the eyes will see stationary book. But the skin receptors and the inner ears will sense the body moving in a forward direction. The eyes and the muscle receptors will send signals that the body is not moving. This confuses the brain and everything is jumbled up in the head. This makes the child dizzy, sick in the stomach and even tired. There is a possibility of the child throwing up, so it is recommended that the parents carry a sick bag each time they are travelling with kids. And if the child is feeling anxious or scared, the condition can deteriorate further.

Although there are medicines available over the counter to deal with motion sickness, some measures should be taken to avoid medicine and also motion sickness. The child should always be made to sit facing in the forward direction. He/she should not face or sit backwards, nor should he be made to sit in a seat facing backwards. This helps the ears and the eyes to send similar kind of signal. It is good if the kid isnt involved in some kind of activity like reading, playing video games or something which is stationary. He/she must be asked to look outside, especially at things which are located at a distance. The same applies when travelling in an airplane. When travelling in a boat, the child can go to the upper deck and look at the horizon. Basically, the child must be made to concentrate at things which are located at a distance and are in motion. When looking at something stationary, the eyes get confused and send wrong signals.

It also helps to sit in a place which is moving the least. Usually, it is the center point of the body, so the more close the child sits to the center, the better. Like when in an airplane, it is good to sit in seats in the middle aisle and not in those which are located near the wings. If the child is sitting in the center of the boat, instead of the front or the side, the lesser seasick the child will feel. In spite of all these measures if the child is still feeling sick a doctor should be consulted. The doctor checks the inner ears for any defect. He will also check other body parts which are responsible for sensing motion. Apart from medicine, pressure bracelets are also available at the local pharmacy. And along with carrying a sick bag or any other plastic bag, the car can be pulled over and the child should be walked out a bit to feel better.

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Narcolepsy – A Rare Sleep Disorder

Narcolepsy, a relatively rare sleep disorder, causes people to fall asleep when they do not want to. This is caused by a neurological disorder. The brain sends signals to the body that are sleep inducing; however, they are sent at inappropriate and unpredictable times. Often it happens when a person is involved in a quiet activity, such as watching a movie or during a meeting. Sometimes a person with this sleep disorder falls asleep while driving, which is obviously extremely dangerous. Others fall asleep while they are eating or talking. The overwhelming need to sleep can come at any hour of the day during any activity.

People suffering with narcolepsy often do not realize how sleepy they are, nor how often they fall asleep. It is often a family member, friend or coworker that convinces them that they need to seek medical help for their sleep disorder.

Narcolepsy has five main symptoms. These are excessive daytime sleepiness, insomnia and fragmented sleep, sleep paralysis, cataplexy and hypnagogic hallucinations. Some people with this sleep disorder experience only one symptom but others can experience all five.

Excessive daytime sleepiness is generally the first symptom to appear. Everyone with narcolepsy has this symptom. The feeling of needing to sleep is so strong that sufferers are unable to fend it off, regardless of how hard they try. These sleep attacks, as they are usually called, can happen several times and last for five to ten minutes.

Insomnia and fragmented sleep are a very common symptom of this sleep disorder. People with narcolepsey often have a very difficult time falling asleep at night, even though they fall asleep easily throughout the day. When they do fall asleep at night they wake up often and do not follow a typical REM / non REM sleep pattern.

Sleep paralysis occurs in about half of the people that suffer from this sleep disorder. For several minutes before falling to sleep or waking up, the person with this symptom cannot talk or move.

The loss of muscle function while awake is cataplexy. These episodes are usually very short in length. Over half of the people with narcolepsy experience this symptom of this sleep disorder. They are caused by a part of REM not functioning correctly. Often, episodes are brought on by anger, laughter or any other strong emotion. Sometimes knees buckle, necks and jaws become weak or the person may fall to the ground. Even though the person looks like they are asleep and cannot talk, they are fully awake and aware of what is happening.

A hypnagogic hallucination is experiencing very vivid and often frightening sounds, images or physical sensations. These occur from dreams just before the person is falling asleep or waking up. It is very difficult for a person with this sleep disorder to distinguish between the dream and reality. These hallucinations often have very dangerous themes and are extremely frightening. Often they are accompanied by sleep paralysis.

There are also several lesser symptoms of narcolepsy. These include blurred vision, migraine headaches, memory or concentration problems and automatic behavior. An apostate of automatic behavior can last for several minutes. During that time a person with this sleep disorder will perform a routine task. The task is often done incorrectly, such as placing a turkey in the dishwasher or writing past the end of a page.

Narcolepsy can be diagnosed and treated with various drugs. If left untreated this sleep disorder can ruin a person’s life.