A Real Dream or Not?

The term lucid dreaming was coined by the Dutch psychiatrist Frederik van Eeden in 1913. It is something of a misnomer since it means something quite different from just clear or vivid dreaming. Nevertheless we are certainly stuck with it. Van Eeden explained that in this sort of dream "the re-integration of the psychic functions is so complete that the sleeper reaches a state of perfect awareness and is able to direct his attention, and to attempt different acts of free volition. Yet the sleep, as I am able confidently to state, is undisturbed, deep, and refreshing."

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Becoming a Lucid Dreamer

Surveys have shown that about 50 percent of people (and in some cases more) have had at least one lucid dream in their lives. (See, for example, Blackmore 1982; Gackenbach and LaBerge 1988; Green 1968.) Of course surveys are unreliable in that many people may not understand the question. In particular, if you have never had a lucid dream, it is easy to misunderstand what is meant by the term. So overestimates might be expected. Beyond this, it does not seem that surveys can find out much. There are no very consistent differences between lucid dreamers and others in terms of age, sex, education, and so on (Green 1968; Gackenbach and LaBerge 1988).

For many people, having lucid dreams is fun, and they want to learn how to have more or to induce them at will. One finding from early experimental work was that high levels of physical (and emotional) activity during the day tend to precede lucidity at night. Waking during the night and carrying out some kind of activity before falling asleep again can also encourage a lucid dream during the next REM period and is the basis of some induction techniques.

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Dream Actions

As we watch sleeping animals it is often tempting to conclude that they are moving their eyes in response to watching a dream, or twitching their legs as they dream of chasing prey. But do physical movements actually relate to the dream events?

Early sleep researchers occasionally reported examples like a long series of left-right eye movements when a dreamer had been dreaming of watching a ping-pong game, but they could do no more than wait until the right sort of dream came along.

Lucid dreaming made proper experimentation possible, for the subjects could be asked to perform a whole range of tasks in their dreams. In one experiment with researchers Morton Schatzman and Peter Fenwick, in London, Worsley planned to draw large triangles and to signal with flicks of his eyes every time he did so. While he dreamed, the electromyogram, recording small muscle movements, showed not only the eye signals but spikes of electrical activity in the right forearm just afterward. This showed that the preplanned actions in the dream produced corresponding muscle movements (Schatzman, Worsley, and Fenwick 1988).

Further experiments, with Worsley kicking dream objects, writing with umbrellas, and snapping his fingers, all confirmed that the muscles of the body show small movements corresponding to the body’s actions in the dream. The question about eye movements was also answered. The eyes do track dream objects. Worsley could even produce slow scanning movements, which are very difficult to produce in the absence of a "real" stimulus (Schatzman, Worsley, and Fenwick 1g88).

LaBerge was especially interested in breathing during dreams. This stemmed from his experiences at age five when he had dreamed of being an undersea pirate who could stay under water for very long periods without drowning. Thirty years later he wanted to find out whether dreamers holding their breath in dreams do so physically as well. The answer was yes. He and other lucid dreamers were able to signal from the dream and then hold their breath. They could also breathe rapidly in their dreams, as revealed on the monitors. Studying breathing during dreamed speech, he found that the person begins to breathe out at the start of an utterance just as in real speech (LaBerge and Dement 1982a).

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The Nature of the Dream World

It is tempting to think that the real world and the world of dreams are totally separate. Some of the experiments already mentioned show that there is no absolute dividing line. There are also plenty of stories that show the penetrability of the boundary.

Alan Worsley describes one experiment in which his task was to give himself a prearranged number of small electric shocks by means of a machine measuring his eye movements. He went to sleep and began dreaming that it was raining and he was in a sleeping bag by a fence with a gate in it. He began to wonder whether he was dreaming and thought it would be cheating to activate the shocks if he was awake. Then, while making the signals, he worried about the machine, for it was out there with him in the rain and might get wet (Schatzman, Worsley, and Fenwick 1988).

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Implications for Research on Sleep and Cognition

These foregoing developmental stages refer to how children think about dreams when they are awake. While asleep and dreaming, children, and also adults, tend to remain at the first stage ¬ implicitly assuming that the dream events are external reality. Out-of-body experiences, with a contradictory mixture of material and mental (external and internal), may provide examples of the second stage (LaBerge, Levitan, Brylowski & Dement, 1988). In the fully lucid dream, the dreamer attains the third stage, realizing that the dream world is distinct from the physical world. 

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Implications for Research on Sleep and Cognition

The fact of lucid dreaming presents conceptual difficulties for certain traditional beliefs about "sleep" and presumed limitations of dream mentation. In a certain sense, the anomalous appearance of lucid dreaming parallels that of the state that has been called "paradoxical sleep." The discovery of REM sleep required the expansion of our concept of sleep. The evidence associating lucid dreaming with REM sleep reviewed above would seem to require a similar expansion of our concept of dreaming, and a clarification of our concept of sleep. 

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Psychophysiological Relationships During REM Sleep

Evidence of voluntary control of other muscle groups during REM was found by LaBerge, Nagel, Dement, and Zarcone (1981) while testing a variety of lucidity signals. They observed that a sequence of left and right dream-fist clenches resulted in a corresponding sequence of left and right forearm twitches as measured by EMG. However, the amplitude of the twitches bore an unreliable relationship to the subjective intensity of the dreamed action. Because all skeletal muscle groups except those that govern eye-movements and breathing are profoundly inhibited during REM sleep for, it is to be expected that most muscular responses to dreamed movements will be feeble. Nonetheless, these responses faithfully reflect the motor patterns of the original dream. Similar observations have been made by Fenwick et al. (1984).

 

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