The Pathology of Sleep *Sleeplessness. Article Sleep. Dict. Prac. Med. By Dr. Copland. 1851.

Every abnormal function or condition, whether it be of quality or quantity, is, of course, a pathological condition, as it is not health. This applies equally to psychical and physical states. If we cannot logically term a total absence of a function a disease of that function, but rather of the organ which fulfils it, we may yet be justified in applying the term " Pathology of Sleep" not only to those prototypes of the somnolent state which indicate a deranged or morbid condition of the mental organ, but also to that negative state which we term insomnium or sleeplessness, a derangement or disorder of quantity, as the other states are of quality; so far the definition of the learned author of the " Medical Dictionary" is correct?"a non-