If we shadows have offended, Think but this, and all is mended, That you have but slumbered here, While these visions did appear And this weak and idle theme, No more yielding than a dream . . . WILLIAM SHAKESPEARE A Midsummer Night's Dream DISTURBANCES in sleep and dreaming have been widely reported as side effects of chlordiazepoxide hydrochloride (Librium). Vivid dreams were reported by Toll1 as early as 1960 as one of the side effects of the new drug which was seen as a potentially useful adjunct to psychotherapy. In another of the early studies, Stanfield2 reported nightmares in some of his patients receiving the drug. Moore3 found that 16% of the 100 patients in his clinical trials noted excessive dreaming. Maggs and Neville4 reported three cases of recurrent dreams in patients receiving chlordiazepoxide. At the time of this writing, it is a common precaution which supervisors