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Volume 8 Issue 3, March 2024

Individual sleep needs

How much sleep is necessary for optimal cognitive function and brain health? Human sleep deprivation experiments in the laboratory, observational studies and the behavioural ecology and evolution literature provide different answers to this question. Fjell and Walhovd adopt a transdisciplinary view of the evidence and argue that individual sleep need is highly flexible and affected by environmental factors, individual needs and motivation. This flexibility and broader context are frequently overlooked in laboratory-based sleep restriction studies and in sleep recommendations, but are important to take into account for a more ecologically valid view of human sleep needs.

See Fjell and Walhovd

Cover image: Viktoriia Patapova/iStock/Getty Images Plus. Cover design: Bethany Vukomanovic.

Editorial

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Correspondence

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Comment & Opinion

  • We need human behavioural change to decarbonize our buildings. This requirement arises from our needs, lifestyle energy choices and interactions with buildings, and is an underexploited, yet essential demand-side opportunity for rapid and sustainable decarbonization. We propose a sufficiency-oriented approach that fosters equitable building decarbonization, while maintaining planetary boundaries.

    • Jeetika Malik
    • Tianzhen Hong
    • Sea Rotmann
    Comment
  • The importance of reproducible scientific practices is widely acknowledged. However, limited resources and lack of external incentives have hindered their adoption. Here, we explore ways to promote reproducible science in practice.

    • Josefina Weinerova
    • Rotem Botvinik-Nezer
    • Roni Tibon
    Comment
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News & Views

  • The sense of belonging to a larger group is a central feature of humanity but its identification in Palaeolithic societies is challenging. Baker et al. use a pan-European dataset of personal ornaments to show that these markers of group identity form distinct clusters that cannot be explained simply by geographical proximity or shared biological descent.

    • Reuven Yeshurun
    News & Views
  • Rising diagnoses of depression in young people is an important concern. Remote measurement technologies are one way that practitioners can screen, monitor or support young people who are diagnosed with depression. In a realist review, Walsh and colleagues show that there is some benefit to using remote measurement technologies, but that young people express concerns about data safety and privacy.

    • Magenta B. Simmons
    • Simon Katterl
    News & Views
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Research Briefings

  • Using large-scale global positioning system (GPS) mobility data, we examined the feasibility and societal impact of the ‘15-minute city’ model across US urban areas. Our findings highlight the environmental benefits of localized living but also its risk of intensifying socioeconomic segregation.

    Research Briefing
  • Leveraging over 2,000 data sessions from a citizen science website, this large-scale exploratory research study revealed demographic (age, sex and daily computer usage) and task features (task enjoyment and baseline movement times) that predicted the extent of successful sensorimotor adaptation in participants’ reaching movements after a visuomotor perturbation.

    Research Briefing
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Reviews

  • In this Perspective, Fjell and Walhovd argue that, to account for considerable interindividual variability in sleep need, future research must consider environmental, individual and situational factors when studying the impact of sleep on cognitive and brain health.

    • Anders M. Fjell
    • Kristine B. Walhovd
    Perspective
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