Cited by 75Sleep and Wakefulness ResearchMemory Processes and InfluencesSleep and related disorders

Assessing the dream-lag effect for rem and nrem stage 2 dreams

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Blagrove, Mark, Fouquet, Nathalie C., Henley-Einion, Josephine A., Pace-Schott, Edward F., Davies, Anna C., Neuschaffer, Jennifer L., Turnbull, Oliver H.·2011·PLoS ONE

Abstract

This study investigates evidence, from dream reports, for memory consolidation during sleep. It is well-known that events and memories from waking life can be incorporated into dreams. These incorporations can be a literal replication of what occurred in waking life, or, more often, they can be partial or indirect. Two types of temporal relationship have been found to characterize the time of occurrence of a daytime event and the reappearance or incorporation of its features in a dream. These temporal relationships are referred to as the day-residue or immediate incorporation effect, where there is the reappearance of features from events occurring on the immediately preceding day, and the dream-lag effect, where there is the reappearance of features from events occurring 5-7 days prior to the dream. Previous work on the dream-lag effect has used spontaneous home recalled dream reports, which can be from Rapid Eye Movement Sleep (REM) and from non-Rapid Eye Movement Sleep (NREM). This study addresses whether the dream-lag effect occurs only for REM sleep dreams, or for both REM and NREM stage 2 (N2) dreams. 20 participants kept a daily diary for over a week before sleeping in the sleep laboratory for 2 nights. REM and N2 dreams collected in the laboratory were transcribed and each participant rated the level of correspondence between every dream report and every diary record. The dream-lag effect was found for REM but not N2 dreams. Further analysis indicated that this result was not due to N2 dream reports being shorter, in terms of number of words, than the REM dream reports. These results provide evidence for a 7-day sleep-dependent non-linear memory consolidation process that is specific to REM sleep, and accord with proposals for the importance of REM sleep to emotional memory consolidation.

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  • It can take several days for repetitive tasks to show up in dreams, a form of dream lag, and almost always these tasks appear in partial forms that are only loosely similar.

    “It can take several days for repetitive tasks to show up in dreams, a form of “dream lag,” and almost always these tasks appear in partial forms that are, again, only loosely similar.81”

    From The overfitted brain: Dreams evolved to assist generalization (2021) · cites this paper as [81]

    The Abstract describes a dream-lag effect in which features of waking events reappear in dreams 5–7 days later, and says incorporations are more often partial or indirect than literal. It does not establish this specifically for repetitive tasks or say they appear “almost always” in loosely similar forms. The Introduction instead treats recurrent routine events as a possible confound in identifying delayed incorporation. Page numbers were not supplied. (LLM, conf=0.88)

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  • Some dream experiences could incorporate waking events.

    “In other words, some dream experiences could incorporate waking events.48–51”

    From Spotlight on dream recall: the ages of dreams (2018) · cites this paper as [50]

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Research works printed but not linked: 1

  1. [6]Nielsen TA Powell RA 1992 The day-residue and dream-lag effects: A review and limited replication. Dreaming 2 67 77

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Authors
Blagrove, M., Fouquet, N. C., Henley-Einion, J. A., Pace-Schott, E. F., Davies, A. C., Neuschaffer, J. L., & Turnbull, O. H.
Affiliations
  • Swansea University (GB)
  • Harvard University (US)
  • Bangor University (GB)
Corresponding author
Blagrove, Mark
Venue
PLoS ONE
Published
2011-10-26
Volume
6
Issue
10
Pages
e26708
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2044514074
Cited by
75
References
49
Citations by year
2026: 4 · 2025: 4 · 2024: 1 · 2023: 6 · 2022: 3 · 2021: 4 · 2020: 6 · 2019: 4 · 2018: 6 · 2017: 6 · 2016: 7 · 2015: 10 · 2014: 5 · 2013: 4 · 2012: 4
FWCI
2.27
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
Keywords
memory consolidation, REM sleep, dream narrative, emotional memory consolidation, sleep-dependent memory
MeSH terms
Dreams, Emotions, Female, Humans, Male, Memory, Sleep Stages, Sleep, REM, Time Factors, Young Adult

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