urely continue to strive for
expression during the night, and we may assume with equal certainty that
the sleeping state renders impossible the usual continuation of the
excitement in the foreconscious and the termination of the excitement by
its becoming conscious. As far as we can normally become conscious of
our mental processes, even during the night, in so far we are not
asleep. I shall not venture to state what change is produced in the
Forec. system by the sleeping state, but there is no doubt that the
psychological character of sleep is essentially due to the change of
energy in this very system, which also dominates the approach to
motility, which is paralyzed during sleep. In contradistinction to this,
there seems to be nothing in the psychology of the dream to warrant the
assumption that sleep produces any but secondary changes in the
conditions of the Unc. system. Hence, for the nocturnal excitation in
the Force, there remains no other path than that followed by the wish
excitements from the Unc. This excitation must seek reinforcement from
the Unc., and follow the detours of the unconscious excitations. But
what is the relation of the foreconscious day remnants to the dream?
There is no doubt that they penetrate abundantly into the dream, that
they utilize the dream content to obtrude themselves upon consciousness
even during the night; indeed, they occasionally even dominate the dream
content, and impel it to continue the work of the day; it is also
certain that the day remnants may just as well have any other character
as that of wishes; but it is highly instructive and even decisive for
the theory of wish-fulfillment to see what conditions they must comply
with in order to be received into the dream.

Let us pick out one of the dreams cited above as examples, _e.g._, the
dream in which my friend Otto seems to show the symptoms of Basedow's
disease. My friend Otto's appearance occasioned me some concern during
the day, and this worry, like everything else referring to this person,
affected me. I may also assume that these feelings followed me into
sleep. I was probably bent on finding out what was the matter with him.
In the night my worry found expression in the dream which I have
reported, the content of which was not only senseless, but failed to
show any wish-fulfillment. But I began to investigate for the source of
this incongruous expression of the solicitude felt during the day, and
analysis reveal