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Insomnia patients often report greater sleep disturbance than found via polysomnography; yet the specific patient factors related to such sleep time misperceptions are poorly understood. We sought to characterize the extent to which a diverse group of patients complaining of insomnia (n=104) misperceive overnight total sleep time and sleep latency, and to identify patient factors associated with these variations.

To evaluate associations between polysomnographic variables in obstructive sleep apnea (OSA) and a variety of psychological responses (including depressive symptoms) as assessed by the Minnesota Multiphasic Personality Inventory (MMPI).

To compare the MMPI responses between nonapneic primary snoring (PS) and obstructive sleep apnea (OSA).

To determine patterns and relative intensity of psychopathology, as measured by the Minnesota Multiphasic Personality Inventory (MMPI), in 108 patients with either psychophysiological insomnia (PI; n=20), insomnia with psychiatric disorder (IPD; n=30), periodic limb movement disorder (PLM; n=28), or obstructive sleep apnea (OSA; n=30).