Population-based sample shows sleep reports may be biased, impacting health associations.
In a population-based sample of middle-aged adults, subjective reports of habitual sleep are moderately correlated with actigraph-measured sleep, but are biased by systematic over-reporting. The true associations between sleep duration and health may differ from previously reported associations between self-reported sleep and health.
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Lauderdale et al. (2008) studied this question.
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