Well, the first thing which is common to all dreams is that we are asleep during their occurrence. The dream is apparently the psychic life during sleep, which has certain resemblances to that of the waking condition, and on the other hand is distinguished from it by important differences. That was noted even in Aristotle's definition. Perhaps there are other connections obtaining between the dream and sleep. One can be awakened by a dream, one frequently has a dream when he wakes spontaneously or is forcibly awakened from sleep. The dream then seems to be an intermediate condition between
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