A claim you hear on longevity podcasts

Does sleep after learning help memory?

The claim checked: What you learn is mostly consolidated the first night after, so sleep well that night Hear it at 25:42

What do the studies say?

Conflicting

Of eight studies, three tied memory to sleep on the first night after learning, three found skill gains came with time passing, asleep or awake, and two had mixed results.

Computed from 8 studies that test this point, each judged by two readers, in full. Sources land on both sides. 10 more studies are waiting for a full read and do not count yet.

What was said on the podcast?

“the first night effect the first night effect is the experimentally observed phenomenon whereby information that you learn on a given day is mostly Consolidated during the night's sleep that you have on that first night after the learning occurs”

Andrew Huberman, Huberman Lab · Optimal Protocols for Studying & Learning · 25:42 on YouTube
Comes up in 18 episodes of the show.

Point 1 of 2 Conflicting

Information learned on a day is mostly consolidated during sleep the first night after learning

Agree 3

other primary study · 2003 · landmark · cited on tape

“Finally, whereas the majority of sleep-dependent motor-skill learning appears to occur during the first night of sleep following training, additional nights of sleep appear to support continued improvements.”

Sleep and the time course of motor skill learning. Learn Mem
Who: 40 right-handed healthy adults aged 18-28 (23 female) trained on a sequential finger-tapping task, plus 30 subjects from an earlier study for comparison
PMID 12888546

trial or observed group · 2006

“Subjects remembered clearly more of the learned vocabulary when they had slept during the night following learning than when they had stayed awake (F1,13 = 7.1, P < 0.05, Fig. 2D).”

Sleep after learning aids memory recall. Learn Mem
Who: High school students learning English–German vocabulary: 12 American students (17.4 yr, 6 male) in experiment 1; 14 male students (18.1 yr) in experiment 2
PMID 16741280

controlled trial · 2012

“Results indicate that temporal order in episodic memories is affected by sleep deprivation in the first night after learning.”

Consolidation of temporal order in episodic memories. Biol Psychol
Who: 34 healthy right-handed student volunteers (17 women), mean age 23.5 (19-28), regular sleepers, randomized to sleep or total sleep deprivation the night after learning
PMID 22705480

Partly agree 2

pooled analysis · 2020

“No positive effect of sleep in the deprivation design was found (g = -0.11, 95 % CI = [-0.66, 0.43]).”

Sleep-dependent motor memory consolidation in healthy adults: A meta-analysis. Neurosci Biobehav Rev
Who: healthy adults aged 18-50 in 48 studies of motor memory tasks (finger tapping, mirror tracing, others)
PMID 32730847

controlled trial · 2022

“In conclusion, our study confirms the beneficial role of sleep on memory consolidation, either just after the encoding of new information or after a day of wakefulness.”

The role of sleep and wakefulness in the recognition of emotional pictures. J Sleep Res
Who: 40 healthy adults aged 18-34 without major physical, neurological or psychological conditions, randomized to Sleep First or Wake First groups, tested at home with a Dreem headband
PMID 35853672

Disagree 3

trial or observed group · 2005

“Moreover, the results of both our experiments suggest that the evolution of delayed gains in this task did not necessarily depend on sleep and that time in the waking state was sufficient.”

A latent consolidation phase in auditory identification learning: time in the awake state is sufficient. Learn Mem
Who: 48 right-handed, normal-hearing female native Hebrew speakers aged 18-26
PMID 15805314

controlled trial · 2010

“Importantly, there was no evidence that offline consolidation depended upon sleep, in that no interactions involving session and day group approached significance (p’s > 0.45).”

Sleep has no critical role in implicit motor sequence learning in young and old adults. Exp Brain Res
Who: 25 young adults (19-24 y) and 24 older adults (60-80 y), right-handed, no sleep disorders
PMID 19795111

other primary study · 2015

“We found that both the development of offline skill loss in sham-stimulated subjects and offline skill gains induced by anodal tDCS critically depend on the passage of time after training, but not on overnight sleep.”

Time- but not sleep-dependent consolidation of tDCS-enhanced visuomotor skills. Cereb Cortex
Who: healthy adults aged 18-53 (mean 28.5 years, 61 female), right-handed, naive to the task, Freiburg and NIH
PMID 23960213

Point 2 of 2 Strong consensus for

So you want the best possible sleep that first night; all-nighters hurt learning

Six of nine studies, two of them pooled analyses, found that missing sleep after learning lowers recall. Three found smaller effects or none.

Computed from 9 studies that test this point, each judged by two readers, in full. 10 more studies are waiting for a full read and do not count yet.

Agree 6

trial or observed group · 2006

“Subjects remembered clearly more of the learned vocabulary when they had slept during the night following learning than when they had stayed awake (F1,13 = 7.1, P < 0.05, Fig. 2D).”

Sleep after learning aids memory recall. Learn Mem
Who: High school students learning English-German vocabulary: 12 American students aged 17.4 yr (6 male) in experiment 1; 14 male students aged 18.1 yr in experiment 2 (sleep vs sleep deprivation)
PMID 16741280

other primary study · 2005

“Explicit recollection was generally enhanced after retention intervals of sleep in comparison to wake intervals [main effect for sleep/wake manipulation, F(1,22) = 4.33, P < 0.05].”

Sleep enhances explicit recollection in recognition memory. Learn Mem
Who: 24 healthy non-smoking young adults (12 men) aged 19-28, habitual 7-9 h sleepers; separate control experiment in 22 adults aged 20-35
PMID 15687230

pooled analysis · 2021

“The results of the first meta-analysis suggest that depriving participants of the first night of sleep after encoding new information results in lower performance at test, supporting the theories of sleep-associated memory consolidation (e.g., Diekelmann & Born, 2010 ; McClelland et al., 1995 ).”

Sleep deprivation and memory: Meta-analytic reviews of studies on sleep deprivation before and after learning. Psychol Bull
Who: Healthy adults aged 18+ (mostly young, mean age ~22) given one night of total sleep deprivation after learning vs a normal night of sleep
PMID 35238586

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other primary study · 2011

“Both declarative and implicit learning indices were significantly higher in the subjects tested after sleep compared to those tested without interposed sleep.”

Acquisition and retention of motor sequences: the effects of time of the day and sleep. Arch Ital Biol
Who: 36 right-handed healthy young adults aged 18-24 (16 women)
PMID 22028091

controlled trial · 2012

“In fact, compared with the sleep deprived group, the sleep group showed better memory retention three days after encoding.”

Consolidation of temporal order in episodic memories. Biol Psychol
Who: 34 healthy right-handed student volunteers (17 women), mean age 23.5, regular sleepers
PMID 22705480

pooled analysis · 2024

“Restricting sleep (3-6.5 hours) compared to normal sleep (7-11 hours) negatively affects memory formation with a small effect size (Hedges' g = 0.29, 95 % CI = [0.13, 0.44]).”

A systematic and meta-analytic review of the impact of sleep restriction on memory formation. Neurosci Biobehav Rev
Who: Participants in sleep restriction studies, mostly young (60% of effect sizes with age involved 20–25-year-olds), combined with total sleep deprivation data from Newbury et al. (2021)
PMID 39427809

Partly agree 3

controlled trial · 2016

“Spaced learning conferred strong protection against the effects of sleep restriction on recall performance, whereas students who had insufficient sleep were more likely to forget items studied over short time intervals.”

Sleep Restriction Impairs Vocabulary Learning when Adolescents Cram for Exams: The Need for Sleep Study. Sleep
Who: Healthy adolescents aged 15-19 at a Singapore boarding school
PMID 27253768

other primary study · 2023

“In addition, although performance improved at the delayed Day 5 session in all conditions, the offline gains were not modulated by the post-learning sleep opportunity, and there was no sleep by reactivation interaction effect, hence suggesting a mere time-dependent effect on the evolution of offline performance.”

Does Motor Memory Reactivation through Practice and Post-Learning Sleep Modulate Consolidation? Clocks Sleep
Who: healthy young volunteers aged 18-30 (40 women), motor sequence (SRTT) learning
PMID 36810845

pooled analysis · 2019

“The overall Hedge’s g effect size for old words was 0.159 (SE = 0.126), which again indicated no significant difference from zero (95% CI [-0.088, 0.406], p = .206), see Figure 3 for a forest plot of effect sizes.”

When does sleep affect veridical and false memory consolidation? A meta-analysis. Psychon Bull Rev
Who: adults in DRM word-list experiments comparing a sleep group (overnight or nap) with a wake group
PMID 30264239

Disagree 0

None.

What else was said but not tested?

A bad first night does not mean the information is permanently lost
Synaptic reordering happens during sleep, especially REM late in the night

More on sleep and light

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