There are all sorts of symptoms attached to the condition, for the unusual mental action can be variously expressed.
The cerebral form has been thus described by a well-known medical writer: "One of the most characteristic features of cerebral neurasthenia is a weary brain.

The sensation is familiar enough to any fagged man, especially if he fall short of sleep.

Impressions seem to go half into one's head and there sink into a woolly bed and die.
Voices sound far off, the lines of a book run into one another and the meaning of them passes unperceived.

Doors bang and windows rattle as they never did before; if a shoestring breaks, an imprecation is upon the lips.

Business matters are in a conspiracy to go wrong.