As I have remarked, these constitute for the most part, in waking life, an undiscriminated mass of obscure feeling, of which we are only conscious as the mental tone of the hour.

And in the few instances in which we do attend to them separately, whether through their exceptional intensity or in consequence of an extraordinary effort of discriminative attention, we can only be said to perceive them, that is, recognize their local origin, very vaguely.

Hence, when asleep, these sensations get very oddly misinterpreted.
The localization of a bodily sensation in waking life means the combination of a tactual and a visual image with the sensation.

Thus, my recognition of a twinge of toothache as coming from a certain tooth, involves representations of the active and passive sensations which touching and looking at the tooth would yield me.

That is to say, the feeling instantly calls up a compound mental image exactly answering to a visual percept.