In many social interactions the frequencies with which people are involved follows a Zipf distribution, sometimes called a power law. For example, a person does not receive the same number of e-mail messages from everyone; the frequencies of e-mail messages tend to follow a Zipf distribution. We report evidence that the frequencies with which characters appear in dreams follow a Zipf distribution. Further, for one dreamer with a large enough number of dreams to work with, the conditional frequencies of characters appearing in a dream, given that a particular character appears in the dream, has itself Zipf distribution. |