On the other hand, subjective sensations due to varying conditions in the skin are a very frequent exciting cause of dreams.

Variations in the state of tension of the skin, brought about by alteration of position, changes in the character of the circulation, the irradiation of heat to the skin or the loss of the same, chemical changes,--these are known to give rise to a number of familiar sensations, including those of tickling, itching, burning, creeping, and so on; and the effects of these sensations are distinctly traceable in our dreams.

For example, the exposure of a part of the body through a loss of the bed-clothes is a frequent excitant of distressing dreams.

A cold foot suggests that the sleeper is walking over snow or ice.

On the other hand, if the cold foot happens to touch a warm part of the body, the dream-fancy constructs images of walking on burning lava, and so on.
These sensations of the skin naturally conduct us to the organic sensations as a whole; that is to say, the feelings connected with the varying condition of the bodily organs.