to my experience in opium eating. But I cannot easily believe that
opium necessarily introduces a greater change in the mind's sleeping
operations, than in those of its wakefulness.

"At one period, indeed, while suffering under a general, nervous
debility, from which I am even now but partially relieved, my troubled
and broken sleep was overshadowed by what I can only express as
'a horror of thick darkness.' There was nothing distinct or certain in
my visions, all was clouded, vague, hideous; sounds faint and awful, yet
unknown; the sweep of heavy wings, the hollow sound of innumerable
footsteps, the glimpse of countless apparitions, and darkness falling
like a great cloud from heaven.

"I can scarcely give you an adequate idea of my situation in these
dreams, without comparing it with that of the ancient Egyptians while
suffering under the plague of darkness. I never read the awful
description of this curse, without associating many of its horrors with
those of my own experience.

"'But they, sleeping the same sleep that night, which was indeed
intolerable, and which came upon them out of the bottoms of inevitable
hell,

"'Were partly vexed with monstrous apparitions, and partly fainted; for
a sudden fear and not looked for, came upon them.'

"'For neither might the corner which held them keep them from fear; but
noises, as of waters falling down, sounded about them, and sad visions
appeared unto them, with heavy countenances.