Now to illustrate the phenomena of trance half-waking, by describing somnambulism.
A curious fate somnambulism has had. When other forms of trance have been exalted into mystical phenomena and figure in history, somnambulism has had no superstitious altars raised to her--has had no fear-worship--has at the highest been promoted to figure in an opera. Of a quiet and homely nature, she has moved about the house, not like a visiting demon, but as a maid of all work. To the public, the phenomenon has presented no more interest than a soap-bubble or the fall of an apple.
Somnambulism is a form of half-waking trance which usually comes on during the night, and in ordinary sleep. When it occurs in the daytime, the attack of trance is still ordinarily preceded by a short period of common sleep.
The somnambulist then, half waking in trance, is disposed to rise and move about. Sometimes his object seems a mere excursion, and then it is remarked that he shows a disposition to ascend heights. So he climbs, perhaps, to the roof of the house, and makes his way along it with agility and certainty: sometimes he is observed, where the tiles are loose, to try if they are secure before he advances. Generally these feats are performed in safety. But occasionally, a somnambulist has missed his footing, fallen, and perished. His greatest danger is from ill-judged attempts to wake and warn him of his perilous situation. Luckily, it is not easy to wake him. He then returns, goes to bed, sleeps, and the next morning has no recollection of what he has done. In other cases, the somnambulist, on rising from his bed, betakes himself to his customary occupations, either to some handiwork, or to composition, or what not.
These three points are easily verifiable respecting his condition. He is in a dream, which he, as it were, acts after his thoughts; occasionally he remembers on the following day some of the incidents of the night before, as part of a dream.
But his common sensibility to ordinary impressions is suspended: he does not feel; his eyes are either shut, or open and fixed; he does not see; he does not observe light, and works as well with as without it; he has not taste or smell: the loudest noise makes no impression on him.
