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Several studies were done to explore the relationship of the personality measure Thin and Thick Boundaries to dream recall frequency and to dream content. In a large sample there was a highly significant positive correlation between thinness of boundaries, measured on the Boundary Questionnaire, and frequency of dream recall. A subsample of 64 “frequent dreamers” (seven or more dreams per week) scored significantly thinner than a group of 69 “non-dreamers” on the Boundary Questionnaire and on each one of the twelve content categories of the questionnaire. Dream content was examined in smaller samples of subjects who scored either very thick or very thin. Dreams of the “thin” subjects were rated significantly more vivid, more emotional, and with more interaction between characters, compared to dreams of the “thick” subjects.