What Does “Sleeping Through the Night” Really Mean?
By Beata Pryszcz | Advanced Certified Sleep Consultant | Nurture Sleep Consultant in training
Five hours? Eight? From bedtime until morning? Before we compare babies, we need to check what we’re counting.
“Sleeping through the night” has no single definition across infant sleep research. Studies have used midnight to 5 a.m., six consecutive hours, eight consecutive hours, or a fixed 10 p.m.–6 a.m. window. Those measures answer different questions. [1, 2]
Parents may picture something longer. In a survey of 412 parents, the expected stretch averaged 9.6 hours. That describes expectations in one sample, not a sleep requirement for every baby. [3]
Sleep develops unevenly.
A 2018 study of 388 infants used both six- and eight-hour definitions. Across the assessments at six and twelve months, about 28%–57% did not meet the selected threshold. Researchers found no significant association between meeting those thresholds and measured mental or motor development. That is reassuring, but it does not mean every sleep concern should be dismissed. [2]
Consistency is another question. In a small study using parent reports for 44 six-month-old's over 13 nights, only one slept eight consecutive hours every night; half never did during the observation period. These findings show variability, not a prediction for every infant. [4]
A better question: how is the family doing?
For babies aged 4–12 months, the American Academy of Sleep Medicine recommends 12–16 hours of sleep across 24 hours, including naps. It does not require twelve uninterrupted nighttime hours. The recommendation does not cover babies under four months, whose sleep varies widely. Sleep quality and timing matter too. [5]
In my work, I ask about feeding, growth, sleep across the whole day, and how the adults are coping. Night waking can be normal, and exhausted parents still deserve practical help. A plan should support the baby’s needs and the family’s rest.
Persistent concerns about sleep, feeding, growth, or caregiver wellbeing belong in a conversation with the appropriate healthcare professional. For every sleep, place the baby on their back on a firm, flat, separate infant sleep surface with only a fitted sheet. [5, 6]
Your baby’s longest stretch is one piece of information. This information does not reflect your parenting skills.
Sources
Please retain these numbered references with the published article. They correspond to the citations in the text.
1. Henderson et al. (2010). Sleeping Through the Night: The Consolidation of Self-regulated Sleep Across the First Year of Life. Pediatrics.
2. Pennestri et al. (2018). The article titled "Uninterrupted Infant Sleep, Development, and Maternal Mood" was published in the journal Paediatrics. Pediatrics.
3. Henderson et al. (2013). Sleeping through the night: a community survey of parents’ opinions about and expectations of infant sleep consolidation. Journal of Paediatrics and Child Health.
4. Pennestri et al. (2020). Sleeping through the night or through the nights? Sleep Medicine.
5. Paruthi et al. (2016). Recommended Amount of Sleep for Pediatric Populations: A Consensus Statement of the American Academy of Sleep Medicine. Journal of Clinical Sleep Medicine.
6. American Academy of Pediatrics. How to Keep Your Sleeping Baby Safe: AAP Policy Explained. HealthyChildren.org.
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