Pre-1900
Folk practice
Sleep guidance lived in proverb, religion, and midwifery before academic child study.
Milestones in order. This is history, not a weekly activity grid.
- Infant sleep manuals
- Behaviourist schedules
- Hospital nursery norms
- Ainsworth night proximity
- Back to Sleep
- Circadian paediatrics
- AAP safe-sleep update
- WHO 24-hour movement
- Digital bedtime conflict
- Equity in safe sleep
Darker cells mean a higher score for this topic on that metric.
Evidence strength91
Daily impact95
Difficulty70
Age span95
Expert consensus75
Urgency88
LessMore
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.
Sleep history tracks shifting expert authority — from religious manuals through behaviourism to attachment and neuroscience frames.
Each era reinterpreted circadian development and safe sleep through available science and cultural values about children, gender, and state responsibility.
Where it began
1932Geneva
Sleep entered formal childcare discourse around 1932 as psychology, paediatrics, and education institutions professionalised family life.
Timeline
1890Infant sleep manuals
Late-Victorian hygiene books began prescribing fixed bedtimes for infants in urban clinics.
1920sBehaviourist schedules
Watson-era advice pushed rigid feeding and sleep clocks that later evidence softened.
1950sHospital nursery norms
Post-war maternity wards normalised separated night nurseries in many high-income systems.
1969Ainsworth night proximity
Attachment research reframed night responsiveness as a security cue, not spoiling.
1992Back to Sleep
Public campaigns cut prone sleep recommendations after SIDS case–control evidence.
2000sCircadian paediatrics
Actigraphy studies mapped infant sleep consolidation across the first year.
2011AAP safe-sleep update
Updated guidance stressed firm surfaces, room-sharing without bed-sharing.
2016WHO 24-hour movement
Global guidance folded sleep duration into 24-hour activity packages for under-fives.
2019Digital bedtime conflict
Reviews linked evening screens with delayed melatonin onset in school-age cohorts.
2022Equity in safe sleep
Public-health work focused on culturally safe messaging beyond one-size checklists.
The eras
1900–1950
Professionalisation
Universities and clinics began publishing age-stage norms and hygiene rules.
1950–1980
Attachment turn
Bowlby, Ainsworth, and Baumrind reshaped how closeness and limits were discussed.
1980–2010
Brain and policy
Neuroscience metaphors and international ECD programmes entered parenting culture.
2010–present
Digital parenting
Social media accelerates method wars; evidence reviews struggle to keep pace.
Practices that changed
Approaches that faded, flipped or were replaced as evidence and culture moved on.
Punitive to relational
1960s–2000sHarsh control models faded as circadian development and safe sleep research linked warmth with better outcomes.
Expert to co-regulation
2000s–2020sParents expected to manage their own arousal while teaching children — not just enforce rules.
National to global
1990s–presentWHO and UNICEF standards interact with local kinship systems worldwide.
Today's sleep discourse blends global WHO standards with local kinship practice and algorithmic parenting media.
Keep exploring
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