Let us compare the dream of Napoleon I., who, incidentally, was an excellent sleeper, with that of the sleepy student, who was awakened by his landlady with the admonition that he must go to the hospital, who thereupon dreams himself into a bed in the hospital, and then sleeps on, with the following account of his motives: If I am already in the hospital, I shan’t have to get up in order to go there. The latter is obviously a dream of convenience; the sleeper frankly admits to himself the motive for his dreaming; but he thereby reveals one of the secrets of dreaming in general. In a certain sense all dreams are dreams of convenience; they serve the purpose of continuing sleep instead of awakening. _The dream is the guardian of sleep, not the disturber of it._ We shall justify this conception with respect to the psychic factors of awakening elsewhere; it is possible, however, at this point to prove its applicability to the influence exerted by objective external excitements. Either the mind does not concern itself at all with the causes of sensations, if it is able to do this in spite of their intensity and of their significance, which is well understood by it; or it employs the dream to deny these stimuli; or thirdly, if it is forced to recognise the stimulus, it seeks to find that interpretation of the stimulus which shall represent the actual sensation as a component part of a situation which is desired and which is compatible with sleep. The actual sensation is woven into the dream _in order to deprive it of its reality_. Napoleon is permitted to go on sleeping; it is only a dream recollection of the thunder of the cannon at Arcole which is trying to disturb him.[BQ]