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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.

Cross-sectional.

University based sleep disorders center.

Sleep disorder groups consisted of patients with psychophysiological insomnia (n=19), sleep state misperception (n=8), insomnia with depressive disorder (n=11), insomnia secondary to Axis I psychiatric disorder other than depression (n=21), periodic limb movement disorder (n=24), and obstructive sleep apnea (n=21 …