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😴Sleep: key voices

Sleep · Circadian development, night waking, and safe sleep environments — among the most researched and debated parenting topics globally.

OverviewOrigins & EvolutionWhat the science saysDaily practiceCulture & meaningGuides & thinkersMyths vs evidenceAround the world
At a glance
Score intensity

Darker cells mean a higher score for this topic on that metric.

Last reviewed Sources & creditsMedia creditsMethodology

Quick answers

What defines sleep?

Circadian development, night waking, and safe sleep environments — framed by circadian development and safe sleep.

Is there strong evidence on sleep?

Evidence score 91/100 reflects published cohort, RCT, and meta-analytic work — gaps remain in cross-cultural replication.

Does sleep apply at every age?

Age range 0–18 years marks peak relevance; principles may extend but intensity varies by developmental stage.

How hard is sleep in practice?

Difficulty score 70/100 captures typical caregiver load — context, support, and temperament modify real experience.

What do experts agree on?

Consensus score 75/100 — areas of agreement and live debate appear in the science section.

How urgent is attention to sleep?

Urgency 88/100 reflects time-sensitivity; some topics tolerate gradual change, others need early action.

Start with this section - Guides & thinkers

Sleep drew researchers from psychology, paediatrics, education, and anthropology.

Eight influential figures below span theory, clinical work, and global policy.

Eight guides worth knowing

01

Ross Greene

b. 1957 · US

Collaborative problem solving

Ross Greene shaped discourse on circadian development and safe sleep through research and public writing.

02

Piaget

1896–1980 · Switzerland

Cognitive stages

Piaget shaped discourse on circadian development and safe sleep through research and public writing.

03

William Sears

b. 1939 · US

Attachment parenting

William Sears shaped discourse on circadian development and safe sleep through research and public writing.

04

Penelope Leach

b. 1937 · UK

Practical child development

Penelope Leach shaped discourse on circadian development and safe sleep through research and public writing.

05

Montessori

1870–1952 · Italy

Prepared environment

Montessori shaped discourse on circadian development and safe sleep through research and public writing.

06

Ellyn Satter

b. 1942 · US

Feeding dynamics

Ellyn Satter shaped discourse on circadian development and safe sleep through research and public writing.

07

T. Berry Brazelton

1918–2018 · US

Infant cues

T. Berry Brazelton shaped discourse on circadian development and safe sleep through research and public writing.

08

Erikson

1902–1994 · Germany/US

Psychosocial stages

Erikson shaped discourse on circadian development and safe sleep through research and public writing.

Guides lab

Select up to three guides to compare side by side.

Pick guides above to compare.

Together they moved sleep from opinion columns toward evidence-informed frameworks still debated today.

Keep exploring

Origins & Evolution

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What the science says

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Daily practice

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Culture & meaning

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Myths vs evidence

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Around the world

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Also worth reading

Cross-category companions chosen for this topic — not more of the same shelf.

👶

Newborn

The first 28 days after birth — physiology, bonding, feeding rhythms, and the shift from womb to world.

Evidence 88 🍼

Infant

From one month to twelve months — motor milestones, first foods, attachment deepening, and emerging sleep patterns.

Evidence 90 🧘

Self-Regulation

Managing one's own arousal before guiding a child — parental self-regulation mediates the impact of stress on discipline quality.

Evidence 87 🍽️

Feeding

Breast, bottle, solids, and picky eating — Ellyn Satter's division of responsibility frames feeding as a relational not battlefield task.

Evidence 93 👁️

Presence

Quality of attention over quantity of hours — presence means undistracted engagement, not perfection or constant entertainment.

Evidence 72 🔁

Consistency

Same rules, same calm — behavioural science shows children learn faster when caregiver responses are predictable and aligned.

Evidence 86 🤝

Co-Parenting

Raising children across households — co-parenting frameworks address communication, schedules, and conflict when parents live apart.

Evidence 68

Nearby ages & themes

🍽️

Feeding

Breast, bottle, solids, and picky eating — Ellyn Satter's division of responsibility frames feeding as a relational not battlefield task.

Evidence 93 📱

Screen Time

Screens displace sleep, movement, and conversation — WHO, AAP, and UNESCO guidance converges on limits under five with quality over quantity debates.

Evidence 82 🚧

Discipline Conflicts

When limits meet resistance — discipline conflicts escalate when stress, inconsistency, or developmental mismatch go unaddressed.

Evidence 79 👯

Sibling Rivalry

Competition for attention and resources — Judy Dunn's sibling research shows conflict is normative but manageable with fair attention and teaching repair.

Evidence 76 🎒

School Readiness

Self-regulation beats flashcards — school readiness combines executive function, language, and social entry more than early academic drilling.

Evidence 88