In Karim Nader's News and Views article “Neuroscience: Re-recording human memories” (Nature 425, 571–572; 2003) the citation of reference 6 was unclear. The reference concerned — Siegel, J. M. Science 294, 1058–1063 (2001) — provides a critical review of the evidence for the role of sleep in memory consolidation. Contrary to an implication of the News and Views citation, however, the author of the review concludes that there is only tenuous evidence for a connection between sleep and memory consolidation.