A dream consists of a variety of ideas, emotions, sensations and images that occur involuntarily in your mind while you sleep. While some dreams are mundane, others can be quite unusual or even unpleasant. While it is unknown whether caffeine can cause weird dreams, it is possible that caffeine might disrupt your usual sleep patterns and make dreaming more likely.
Dreams
Most adults have at least four to six dreams per night, according to the University of California’s Quantitative Study of Dreams research website. Dreams generally occur during the rapid eye movement phase of sleep, or REM, but also might occur in the hour or two before you wake. Some theorists, such as Freud and Jung, believed that dreams were symbolic or held a hidden meaning, but current research has been unable to prove this.
Caffeine’s Effect on Sleep
While little research has been conducted specifically on caffeine’s effect on dreams, quite a bit is known about how caffeine affects sleep. Caffeine blocks the adenosine receptors in your brain. Adenosine is the substance that makes you feel drowsy or tired, so consuming caffeine often makes you feel more alert. Caffeine also speeds up the functions of the central nervous system, which increases your breathing and heart rate and makes you feel more energized. These two effects not only make it more difficult for you to fall asleep, but also might reduce the amount of deep sleep you get when you do fall asleep. Spending less time in deep sleep could increase the length of time you spend in other stages of sleep, which might make you dream more frequently.
Considerations
The effects of caffeine usually begin within 30 minutes of consumption and might last as long as 14 hours, according to the American Academy of Sleep Medicine. To prevent caffeine from disrupting your sleep, avoid consuming caffeine too close to your bedtime. The more caffeine you consume, the more likely you are to experience sleep problems. Generally, most people can consume about 200 milligrams of caffeine throughout the day without experiencing adverse side effects, according to MayoClinic.com.
Other Factors
While caffeine might alter your sleeping patterns and cause unusual dreams, dreams also can be influenced by a number of other factors. Stress, strong emotions, medications, illness, alcohol, food or beverages are a few things that also could influence dreams. If you are concerned about your sleep patterns or the dreams you are having, talk to your doctor for advice.
References
- American Heritage Dictionary of the English Language, 4th Edition; Dream; September 2000
- University of California; Frequently Asked Questions; G. William Domhoff et al.; October 2010
- American Academy of Sleep Medicine; Sleep and Caffeine; Donald R. Townsend, PhD, August 2006
- MayoClinic.com; Caffeine: How Much Is Too Much?; March 2011
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