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A little over a decade ago the exploration of both inner and outer space went into high-speed operation. Men now have not only seen the other side of the moon but have made contact with its material and brought back samples of the strange stuff for analysis. The explorations into the mysterious dark side of our mental life, that which takes place mostly at night, from which we can retrieve so little for the scientist, is not doing so well. When the technology was worked out for plotting the changes in electroencephalograph (EEG) sleep stages throughout the night and it was established that these could be used as reliable indicators of the types of mental activity going on at the time, great expectations were aroused that the unconscious world would be mapped in ways never before possible. This, we were sure, was bound to unlock secrets of
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