To replicate a previous study, 16 psychophysiological insomniacs were randomly assigned to either Theta feedback or sensorimotor rhythm (SMR) feedback. Evaluations by home sleep logs and by 3 nights in the laboratory were done before biofeedback, immediately after biofeedback, and 9 months later. Results from this study replicate previous findings. Both Theta and SMR feedback seemed effective treatments of insomnia according to home sleep logs. According to evaluations at the sleep laboratory, tense and anxious insomniacs benefited only from Theta feedback but not from SMR feedback, while those who were relaxed at intake but still could not sleep benefited only from SMR but not from Theta feedback.

Through psychiatric interviews and psychological tests the authors studied 38 adults who reported experiencing at least one nightmare per week. Nearly all of the subjects had a lifelong history of frequent nightmares. Four of the subjects met DSM-III criteria for schizophrenia, 9 met the criteria for borderline personality, and 6 met the criteria for schizotypal personality. The others had no specific diagnosis, and none of the subjects had a diagnosis of typical neurosis. Many had mentally ill relatives. Most had artistic interests and talents. These nightmare sufferers may be seen as unusually vulnerable, with a potential for mental illness--especially schizophrenia--as well as a potential for artistic achievement.

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