disturbance occurs within clauses, in contrast to dera ilment, in which the disturbance
is between  clauses. This has sometimes been refe rred to a “word salad” to convey the
degree of linguistic disorgan ization. Mildly ungrammatica l constructions or idiomatic
usages characteristic of a particular region al or cultural backgrounds, lack of educa-
tion, or low intelligence should not be co nsidered incoherence. The term is generally
not applied when there is evidence that the disturbance in speech is due to an aphasia.
insomnia A subjective complaint of difficulty falling or staying asleep or poor sleep quality.