Subjective-objective sleep discrepancy exists in patients with insomnia, OSA, co-morbid sleep disorder, and even in people with normal sleep, with both under estimation and over estimation of important sleep variables. Insomnia complaints seem to be the strongest correlate of sleep discrepancy, although co-morbid insomnia and OSA may additionally exacerbate the discrepancy. Self-reported insomnia has a significantly negative impact on QOL in both physical and mental components.
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