The Element Encyclopedia of 20,000 Dreams: The Ultimate A–Z to Interpret the Secrets of Your Dreams. Theresa Cheung

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СКАЧАТЬ prolonged periods of isolation decreased the need for sleep. In other words, the fewer stimuli received from people or external contacts during the day, the less sleep was required. It seems we have a sleep control center at the base of our brain linked with activity during wakefulness. When that gets overloaded we get tired, but if there have not been enough stimuli from the outside world, the sleep mechanism isn’t triggered. It seems, therefore, that boredom and lack of stimuli may account for many cases of insomnia. (Paradoxically, overstimulation also produces insomnia.)

      The Four Stages of Sleep

      ‘Yet it is in our idleness, in our dreams, that the submerged truth sometimes comes to the top.’ Virginia Woolf

      Perhaps the best way to understand sleep and dreams is to understand the brain. At the very start of the twentieth century it was found that the brain gave off electrical impulses, and by the 1920s scientists could measure brain waves. To obtain these readings, electrodes were attached to various parts of the head, the impulses being transformed onto electroencephalograms (EECs) on computer screens.

      It seems that once you settle down to bed, your brain and body undergo radical changes from their waking state. The difference between being asleep and being awake is loss of conscious awareness, and once you start to doze, dream researchers believe you progress through four stages of sleep. These form the basis of a cycle that repeats up to four or five times every eight hours of sleep.

      During the first stage, your body and mind become relaxed. Heart and breathing rate slow down, blood pressure lowers, body temperature drops slightly and eyes roll from side to side. You are neither fully conscious, nor fully unconscious, and could easily awake if disturbed. This stage of gradually falling asleep is also called the hypnagogic state (the hypnopompic state is a similar state when you are just waking up) and you may experience hallucinations that float before your eyes.

      In stage two, breathing and heart rate become even slower, eyes continue to roll and you become more and more unaware of the noises of the outside world. It isn’t until the third stage of sleep, however, that you are sleeping soundly and it would be difficult to wake you. Finally, you enter a deep sleep state known as non-rapid eye movement (NREM) when your brain is released from the demands of the conscious mind. It will now be quite hard to wake you and, although you may sleepwalk or have night terrors, you will rarely be able to remember them. This slow-wave sleep cycle lasts about ninety minutes. At the end of stage four, you move back through stages three and two and one, at which point you enter a phase called rapid eye movement, or REM, sleep.

      REM Sleep

      REM sleep is recognized by tiny twitches of facial muscles and slight movements of the hands. Blood pressure rises, breathing and heartbeat become faster, eyes dart rapidly around the eyelids under closed eyelids as if looking at a moving object and, if you are a man, you may have an erection. Researchers have discovered that when sleepers are awakened during REM sleep they typically say they have been dreaming. (You may also feel temporarily paralyzed if awakened during this stage, as if something malevolent is pressing down on you; this phenomenon can explain the supposed succubus, incubus and alien abduction experiences.)

      Most of the dreams you remember occur during the REM stage when the brain is fully active. After about ten minutes of REM you enter stages two, three and four again, and keep moving backwards and forwards through the sleep cycle. As the cycle continues, however, the REM phase gets longer and longer with the longest phase being around thirty to forty-five minutes. Of all your dreams during all the stages of REM and NREM (it has recently been discovered that we can dream then too), the final REM stages are the ones you are most likely to remember.

       How much sleep do we need?

      We spend approximately one third of our life asleep. This means that by the time we reach the age of ninety 1 we have been asleep approximately thirty years. The exact amount of sleep each person needs depends on many factors, including age and activity levels during the day. Babies sleep for about fourteen hours a day, whilst teenagers need about nine hours on average. For most adults occupied physically and mentally during the day, eight hours a night appears to be the average amount of sleep needed, although some people may need as few as five, or as many as ten hours, of sleep each day. Older people tend to need around six hours sleep a night.

      Because sleeping and dreaming are so crucial, your brain may sometimes demand the sleep it needs so that you don’t get into mental or physical overload. That’s why you may sometimes drop off for no apparent reason when you’re traveling by car or train, or watching TV.

      Research on sleep-deprived animals shows that sleep is necessary for survival. For example, whilst rats normally live for two to three years, those deprived of REM sleep survive only about five weeks on average, and rats deprived of all sleep stages live only about three weeks. Other studies have shown that subjects repeatedly awoken during REM—which means they were deprived of dreams—become anxious, bad tempered and irritable. This suggests that sleep is vital for physical rest and repair, and REM sleep, when we are most likely to dream, is essential for our emotional well-being. Therefore, although we still aren’t sure about the whys, whats and hows of sleep and dreams, it’s possible to conclude that the reason we sleep is to dream.

      A Brief History of Dream Interpretation

      ‘Now Allah has created the dream not only as a means of guidance and instruction, I refer to the dream, but he has made it a window on the World of the Unseen.’ Mohammed, the Prophet

      Ancient art and literature are crowded with references to dreams. For thousands of years dreams have been credited with supernatural or prophetic significance by the majority of the world’s spiritual traditions. The Bible, for instance, makes it clear that dreams are divine messages and this explanation for dreams was shared by the ancient Egyptians, Greeks and Romans, all of whom also believed that dreams had healing powers.

      Certain cultures, such as the Australian Aborigines and many African and Native American tribes, have always believed dreaming to be a way in which an individual can enter into the collective spirit memory. To this day, dream pooling plays an important role in those societies where tribal members gather together for the purpose of interpreting dreams. Another view is held by the Inuit of Hudson Bay in Canada, who believe that when a person falls asleep and dreams, their soul goes wandering.

      The Egyptians are thought to have been the first to develop a system of contrary dream interpretation; a positive dream, for example, predicts misfortune and a nightmare predicts an improvement in waking fortunes. They produced the earliest known dream dictionary, written approximately 4,000 years ago. Now called the Chester Beatty Papyrus, it came from Thebes in Egypt and is kept in the British Museum.

      It was the ancient Greeks, however, who first proposed the theory that dreams were not from some external, divine source but internal communications, or the divine spark within. Plato (427-347 BC) suggested that dreams were expressions of a person’s hidden desires, whilst his pupil Aristotle (384-322 BC) speculated that dreams shared similar themes and were not divine oracles but coincidences. It was the ‘father of medicine’ Hippocrates (460-377 BC) who proposed that dream symbols reflect the state of the dreamer’s body—for example, fire denoted indigestion—and should be regarded as valuable diagnostic tools.

      The first fully-fledged dream researcher to focus on dream symbols and dream themes was a Roman living in Greek Asia Minor called Artemidorus (AD 138-180), who wrote a book about dream interpretation that is still in print. As far as Artemidorus was concerned, dream symbols had certain meanings but the most important aspect of dream interpretation was the symbols’ personal significance to the dreamer, along СКАЧАТЬ