(e.g., breathing-related sleep disorder). When  a complaint of nonres torative sleep occurs
in isolation (i.e., in the absence of difficulty initiating and/or maintaining sleep) but all di-
agnostic criteria with regard to frequency, duration, and daytime distress and impairments
are otherwise met, a diagnosis of other specif ied insomnia disorder or unspecified insom-
nia disorder is made.