Insomnia is underrecognized in patients with cancer. By identifying clinical correlations and predisposing factors of insomnia, interventions may be initiated to treat insomnia.Methods:
Consecutive patients referred to palliative medicine services were screened with a single question. Patients answering affirmatively completed the Insomnia Severity Index (ISI). Patients were screened for depression, fatigue, and pain. Spearman correlation was performed for associations.Results:
Of 715 consecutive patients, 102 had sleep problems and 64 had clinical insomnia by the ISI criteria. Insomnia correlated with depression (r = .32), pain (r = .29), and tiredness (r = .40) but not with age or precipitating factors.Discussion:
Insomnia severity moderately correlates with depression, pain, and tiredness. We found no association of insomnia severity with age or medications.Conclusion:
Insomnia, pain, depression, and tiredness are a symptom cluster.