ABSTRACT
SINCE the notion of a dream as an occurrence that is logically independent of the sleeper’s waking impression has no clear sense, it follows that the notions of the location and duration of a dream in physical time also have no clear sense. I mean that this is so if one keeps to the primary concept, where the sole criterion of the occurrence of a dream is the waking report. One may be easily tempted however to give a sense to these notions, as the following will illustrate.
