[[Sleep]] Insomnia can be described as either an independent disorder (primary) or as a symptom of a mental disorder (secondary).[7](https://jcsm.aasm.org/doi/10.5664/jcsm.4452#B7) Regardless of onset temporal sequence, insomnia can evolve into an independent disorder.[7](https://jcsm.aasm.org/doi/10.5664/jcsm.4452#B7) [[The prevalence and management of Poor sleep quality in a secondary care mental health population]]