This is a pre-copyedited, author-produced version of an article accepted for publication in Sleep following peer review. The version of record Pereira, R.. et al. (2021). Is daytime napping a risk factor for persistent insomnia symptoms? [Abstract]. Sleep, 44 ( Supp 2), p A129 is available online at: https://static.primary.prod.gcms.the-infra.com/static/site/sleep/document/virtual-2021?node=0d986e177862f43df8ef