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During the Gulf War , he served as regimental psychiatrist for the U. In addition to authoring multiple journal articles, he has edited two books on combat psychiatry Contemporary Studies in Combat Psychiatry , Greenwood Press, and The Gulf War and Mental Health: A Comprehensive Guide , Praeger Press, and done pioneering work on sleep restriction and performance. Caffeine and Sleep.

Home Sleep Topics Caffeine and Sleep. Symptoms Caffeine is a stimulant. In moderate doses, it can: Increase alertness Reduce fine motor coordination Cause insomnia Cause headaches, nervousness and dizziness It has also been known to result in: Anxiety Irritability Rapid heartbeat Excessive urination Sleep disturbance A "caffeine crash" once the effects wear off Treatment If the conditions listed under "symptoms" occur, discontinue the use of caffeine. Coping In order to sleep better at night and reduce daytime sleepiness, try practicing the following sleep tips: Maintain a regular bed and wake time schedule including weekends Establish a regular, relaxing bedtime routine such as taking a bath or listening to music Create a sleep environment that is dark, quiet, comfortable and cool Sleep on a comfortable mattress and pillows Use your bedroom only for sleep and sex Finish eating at least hours before your regular bedtime Exercise regularly but avoid it a few hours before bedtime Avoid caffeine e.

Reviewed by: Greg Belenky, M. Popular Articles. How Sleep Affects Your Immunity. Featured Article Image. Sleep Routine. How much sleep do you want? As a sleeping tool, the Bedtime Calculator conveniently calculates what How Sleep Works. Few people worry about spending too much time in bed. An extra hour or two of stolen sleep on Sunday can feel like heaven after a long week of work and family activities.

But did you know that clocking more than the recommended amount can negatively impact your health?

What is Caffeine, and is it Good or Bad For Health?

For most adults, getting between seven and nine hours of sleep But the U. According to a report by commodities analysts for Businessweek, Scandinavian nations such as Finland consume more caffeine per capita -- mostly in coffee -- than any other country. The report noted other surprising trends, like a move in Brazil to offer coffee drinks as part of grade-school lunches [source: Wallace ]. Although Americans aren't the world's biggest per-capita caffeine fiends, we're not exactly teetotalers. Research by the U.

But roughly 20 percent to 30 percent of Americans consume more than milligrams -- considered a high dose of the drug -- on a typical day [source: Kovacs ]. Elsevier Science. Retrieved 17 June Greenwood Press. Food and Chemical Toxicology. World Health Organization. October [April ]. Retrieved 23 December Mayo Clinic. Retrieved 15 April Obstetrics and Gynecology. The Journal of Clinical Investigation. Journal of Food Science.

Pediatric Pulmonology. Biology of the Neonate. The New England Journal of Medicine. The Journal of Physiology.

Effects of caffeine

Journal of Perinatology. Retrieved 13 February The American Journal of Medicine. Clin Respir J. Orthomolecular Psychiatry.

What is caffeine?

Journal of Alzheimer's Disease. Caffeine does not usually affect performance in learning and memory tasks, although caffeine may occasionally have facilitatory or inhibitory effects on memory and learning. Caffeine facilitates learning in tasks in which information is presented passively; in tasks in which material is learned intentionally, caffeine has no effect.

Caffeine facilitates performance in tasks involving working memory to a limited extent, but hinders performance in tasks that heavily depend on this, and caffeine appears to improve memory performance under suboptimal alertness. Most studies, however, found improvements in reaction time.

The ingestion of caffeine does not seem to affect long-term memory. Its indirect action on arousal, mood and concentration contributes in large part to its cognitive enhancing properties. Progress in Brain Research.

Ker K ed. Nutrition Reviews. Quote: Caffeine-induced increases in performance have been observed in aerobic as well as anaerobic sports for reviews, see [26,30,31] Sports Medicine. Primary Care. Amphetamines and caffeine are stimulants that increase alertness, improve focus, decrease reaction time, and delay fatigue, allowing for an increased intensity and duration of training The American Journal of Clinical Nutrition.

Journal of the International Society of Sports Nutrition. Medicine and Science in Sports and Exercise. European Journal of Sport Science. Journal of Science and Medicine in Sport. Health Canada. March Retrieved 8 November The Addiction Casebook. American Psychiatric Pub. Retrieved 3 August Archives of Gynecology and Obstetrics.

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Caffeine | Psychology Today

Part B, Developmental and Reproductive Toxicology. BMC Medicine. Public Health Nutrition.

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Reproductive Health. Journal of Applied Physiology.

U.S. Food and Drug Administration

The American Journal of Physiology. A review". Scandinavian Journal of Gastroenterology. Welsh EJ ed. Retrieved 2 January Journal of Human Nutrition and Dietetics. Renal Physiol.

The claim: caffeine causes dehydration". New York Times. Exercise and Sport Sciences Reviews. Advances in Psychiatric Treatment. Expert Review of Neurotherapeutics. Psychological Medicine. Psychiatry, 2 Volume Set.

Volume 1. Table Substance Dependence". Psychiatry and Pedopsychiatry. Prague: Karolinum Press. At a high dose, caffeine shows a euphoric effect. Encyclopedia of Behavioral Neuroscience.

Caffeine Chart

Therefore, caffeine and other adenosine antagonists, while weakly euphoria-like on their own, may potentiate the positive hedonic efficacy of acute drug intoxication and reduce the negative hedonic consequences of drug withdrawal. Pharmacology for health professionals 3rd ed. Chatswood, N.

In contrast to the amphetamines, caffeine does not cause euphoria, stereotyped behaviors or psychoses. Neuropsychopharmacology and Therapeutics. However, in contrast to other psychoactive stimulants, such as amphetamine and cocaine, caffeine and the other methylxanthines do not produce euphoria, stereotyped behaviors or psychotic like symptoms in large doses. Elsevier Health Sciences. By comparison with amphetamines, methylxanthines produce less locomotor stimulation and do not induce euphoria, stereotyped behaviour patterns or a psychotic state, but their effects on fatigue and mental function are similar.

Psychomotor stimulants Drugs that cause wakefulness and euphoria Amphetamines, cocaine, methylphenidate, caffeine. Current Addiction Reports.