O012 Do healthy sleepers demonstrate sleep-wake state discrepancy?

Sleep-wake state discrepancy is a common phenomenon for individuals with insomnia, where an individual self-reports worse sleep parameter values than observed in polysomnography-derived values. However, this presumes there is no systematic bias in polysomnography-derived versus self-report sleep estimates in healthy individuals, which may not be true. This study aimed to test for potential bias in sleep-wake state discrepancy in a group of healthy individuals (N=49, aged 33.9±14.1 years) who underwent in-laboratory polysomnography (PSG) and completed a concurrent self-reported sleep diary. Healthy individuals demonstrated sleep-wake state discrepancy for multiple sleep parameters, reflected as ‘better’ self-reported sleep values than PSG-derived. For total sleep time (TST), there was a significant difference (of 51.3 minutes, p