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     How many an(prenominal) people really do dream? E very(prenominal)one dreams, whether the dream is remembered or not. Throughout the night, there are many stages of sleep that everyone goes through. These stages include light sleep, deep sleep, and dream sleep. Nightmares are withal considered dreams, just caused by different emotions. Scientists also have many galvanic appliances and have done many tests to study dreams.     Dreams are very tangled things. Scientists have a hard time trying to understand why people dream. Although recently, neurosurgerys precise methods of research and invention of sophisticated galvanizing appliances, have enabled the scientists to increase their knowledge of the human brain, nervous systems, and the bodys biochemistry (Strachey 20). The invention of the electroencephalograph, otherwise cognise as an EEG, has made it possible for a trained operator to read the brains reactions during conflagrate fulness, rest, and sleep (Schneider). The shape detects and enormously amplifies the very faint electrical impulses produced by the brain placing electrodes against subjects sell (Freud). Professor Nathanial Kleitman of Chicago university, discovered that babies have a sleep measure of fifty to sixty minutes after which they are inclined to wake up, although obviously they cant always(Freud). As children grow, the body begins to intermit the ninety-minute cycle associated with adult sleepers. The pattern of sleep is acquired and controlled by environmental and social conditioning. However, as people grow older the body tends to revert to the naptime habits of babyhood (Freud). Yet, though people more or less choose when to sleep, the rudimentary ninety-minute rhythm remains. It is biological and not controlled by consciousness, rather as a healthy persons metabolism functions autonomously (Parker 93). Eugene Aserinsky noticed that after an child fell asleep its eyes moved ben eath the unopen lids. Also, at intervals during sleep and was the first movement when the baby began to wake(Freud). Kleitman and Aserinsky resolute to investigate whether such a pattern could be found in adult sleepers as well (Freud). By attaching extra electrodes from the EEG instrument to areas around volunteer sleepers eyes, the two scientists were able to varan brain impulses and movements, while measuring respiration and body movements (Freud). The scientists concluded that there were two types of eye movement. Slow as found in babies and very fast movements, this could last from a few minutes to over a half an hour (Freud). These rapid eye movements, which are commonly known as REMs appeared to occur at intervals throughout the night (Beare).