Insomnia among brain tumor patients: a population-based prospective study of tumor patients in northern Finland.

Patients with neurological diseases often suffer from sleep disturbances. Insomnia among adult brain tumor patients has usually been studied as part of quality-of-life studies, or some case reports on insomnia in these patients have been described. The authors aimed to study insomnia in a prospective study setting among patients with primary brain tumors and evaluate whether insomnia is related to tumor laterality. Entire study population consisted of 70 patients with a solitary primary supratentorial brain tumor treated surgically at the Clinic for Neurosurgery, Oulu University Hospital. The overall functional state of the patients was assessed by the Karnofsky Performance Scale, depression was measured by Beck Depression Inventory, and insomnia by Nottingham Health Profile. Repeated measurements were assessed before tumor operation as well as 3 months and one year after surgery. Prevalence of insomnia among patients with a primary brain tumor waiting for surgery was higher compared to general population, but level of insomnia significantly decreased as soon as 3 months after tumor operation. Patients with a bilateral primary brain tumor had significantly more often insomnia without comorbid depression compared to patients with a left or right tumor for up to one year after operation. The authors suggest that insomnia among patients with a bilateral brain tumor may not be associated with depression but have other biological background.