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It’s possible, however, that you start craving more of this dopamine ‘reward’, which is caused by many pleasant experiences, including eating nice food, having sex, winning a game and earning money. Alcohol and many illegal drugs cause a surge of dopamine too, which is partly why people get addicted to them.
Dopamine also has a role to play in controlling memory, mood, sleep, learning, concentration and body movements.
Activities that make you feel good will also raise dopamine. These include exercising, meditating, having a massage and getting enough sleep. Thinking about your achievements and all the good things in your life can also help.
GABA
Gamma aminobutyric acid (GABA) is a naturally occurring amino acid that works as a neurotransmitter in your brain. Neurotransmitters function as chemical messengers. GABA is considered an inhibitory neurotransmitter because it blocks, or inhibits, certain brain signals and decreases activity in your nervous system.
The main categories are:
stimulants (e.g. cocaine)
depressants (e.g. alcohol)
opium-related painkillers (e.g. heroin)
hallucinogens (e.g. LSD)
Drugs work in body in a variety of ways. They can interfere with microorganisms (germs) that invade your body, destroy abnormal cells that cause cancer, replace deficient substances (such as hormones or vitamins), or change the way that cells work in your body.
Drug abuse is a serious factor in memory loss and a lack of concentration, which can affect aspects of your life you may not have considered. Drugs can make it hard for you to study, improve your skills at work, learn and retain new concepts, and even pay attention to what's happening around you.
Alcohol, tobacco, or drug use have long been recognized as a cause of memory loss.
Smoking harms memory by reducing the amount of oxygen that gets to the brain. Studies have shown that people who smoke find it more difficult to put faces with names than do nonsmokers. Illegal drugs can change chemicals in the brain that can make it hard to recall memories.
Alcohol and Sleep
Alcohol often is thought of as a sedative or calming drug. While alcohol may induce sleep, the quality of sleep is often fragmented during the second half of the sleep period. Alcohol increases the number of times you awaken in the later half of the night, when the alcohol's relaxing effect wears off. It prevents you from getting the deep sleep and REM sleep you need, because alcohol keeps you in the lighter stages of sleep. With continued consumption just before bedtime, alcohol's sleep-inducing effect may decrease as its disruptive effects continue or increase. The sleep disruption resulting from alcohol use may lead to daytime fatigue and sleepiness. The elderly are at particular risk for alcohol-related sleep disorders, because they achieve higher levels of alcohol in the blood and brain than do younger adults after consuming an equivalent dose. Bedtime alcohol consumption among older adults may lead to unsteadiness if walking is attempted during the night, with increased risk of falls and injuries.
Drugs and Academic achievement
Teens who abuse drugs have lower grades, a higher rate of absence from school and other activities, and an increased potential for dropping out of school. Most people who use drugs regularly don’t consistently do well in school. male student with book over face sitting against wall Studies show that marijuana, for example, affects your attention, memory, and ability to learn. Its effects can last for days or weeks after the drug wears off. So, if you are smoking marijuana daily, you are not functioning at your best. Students who smoke marijuana tend to get lower grades and are more likely to drop out of high school.
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