For babies born weeks before their due date, sleep is not simply a period of rest. It is an active biological state during which the brain organizes connections, regulates sensory input and consolidates the foundations of later development. Yet in neonatal intensive care units, sleep can be repeatedly interrupted by alarms, medical procedures, handling, light and noise. A new study published in Pediatric Research suggests that one of the simplest forms of developmental care—placing a premature infant directly against a parent’s bare chest—may help make sleep more stable. The research, led by Sottemano, Bos, De Cola and colleagues, examined how skin-to-skin contact, or SSC, affects the sleep patterns of preterm infants using automated measurements. The findings add to growing evidence that close physical contact is not only emotionally meaningful but may also influence the infant brain and nervous system at a critical stage of maturation.
Preterm birth disrupts the biological timetable in which sleep normally develops. In the womb, the fetus experiences a relatively protected environment with rhythmic maternal sounds, gentle movement, stable temperature and continuous physical containment. After premature delivery, those conditions are replaced by the highly stimulating environment of intensive care. A very immature infant must adapt to respiratory support, monitoring equipment, feeding schedules and frequent clinical interventions, often before the neural systems that regulate sleep are fully developed. Sleep in these infants can therefore be fragmented, with repeated transitions between sleep and wakefulness or brief arousals that may not always be obvious to caregivers. Such instability matters because sleep supports energy conservation, autonomic regulation and neurophysiological maturation. The new study addresses a central question in neonatal care: whether a low-technology intervention can protect the continuity and organization of sleep during this vulnerable period.
Skin-to-skin contact is usually performed by placing the diapered infant upright on the caregiver’s bare chest and covering both bodies with a warm blanket. The practice, often associated with kangaroo care, gives the infant direct exposure to the caregiver’s warmth, breathing movements, heartbeat and voice. These signals may act as external regulators for immature physiological systems. Tactile stimulation can influence the autonomic nervous system, which controls heart rate, breathing and stress responses, while thermal contact reduces the infant’s need to expend energy maintaining body temperature. The caregiver’s chest also provides a comparatively predictable sensory environment, potentially buffering the sudden changes in sound, light and handling that occur in a neonatal unit. Earlier research has linked SSC with improved physiological stability, but its specific influence on sleep structure has been less clearly quantified. The investigators set out to determine whether that familiar intervention also changes how infants move through sleep.
The study focused on sleep as a dynamic pattern rather than as a single total measured over many hours. Infant sleep includes periods of different behavioral and neurophysiological organization, and premature babies may show less clearly separated states than full-term newborns. Stability refers not merely to the amount of time an infant appears to be asleep, but to the continuity of that sleep and the frequency of disruptions or transitions. To investigate those features, the researchers used automated methods to analyze infant sleep. Automated analysis can process physiological or behavioral signals continuously and identify patterns that may be difficult to capture through occasional bedside observation. This approach is particularly valuable in neonatal research, where brief arousals can be missed and manual scoring can vary between observers. By applying standardized computational measurements, the team sought to quantify whether SSC was associated with longer periods of uninterrupted sleep and fewer signs of fragmentation.
The researchers hypothesized that SSC would increase the total duration of sleep while reducing fragmentation. Their findings, summarized by the study’s title, indicate that skin-to-skin contact improves sleep stability in preterm infants. That conclusion is important because it shifts the conversation beyond the widely recognized benefits of SSC for temperature control, cardiorespiratory regulation and parent–infant bonding. A more stable sleep pattern could mean that the infant spends less time reacting to environmental disturbances and more time in sustained states that support recovery and development. The available report does not establish that every infant will sleep longer or that SSC produces an identical response across all clinical circumstances. Nor does it provide, in the information released here, numerical estimates for the change in sleep duration or the exact reduction in fragmentation. Nevertheless, the central result suggests that the intervention has measurable effects on sleep organization when assessed with automated tools.
The biological explanation may involve several systems working together. Premature infants have immature pathways linking the brainstem, hypothalamus and autonomic nervous system, all of which contribute to sleep–wake regulation. SSC may provide repeated, coordinated sensory input that helps these networks maintain a more stable state. The caregiver’s body can also reduce thermal fluctuations, while the slow rhythm of breathing and heartbeat may supply predictable cues that support physiological entrainment. In addition, close contact may reduce stress-related activation. Excessive stress signaling can elevate energy demands and promote arousal, potentially interrupting sleep. By lowering the infant’s physiological burden, SSC could make it easier to remain asleep without suppressing normal developmental transitions. The effect is therefore unlikely to be explained by a single “sleep switch”; it may reflect the combined influence of temperature, touch, pressure, sound, odor and emotional regulation.
The use of automated sleep assessment is one of the study’s most significant features. Conventional observation often classifies an infant as asleep or awake based on movement, eye opening and general appearance. That method is practical but can overlook subtle arousals, short transitions and changes in sleep continuity. Automated systems can analyze streams of data over extended periods and apply the same criteria repeatedly, allowing researchers to detect patterns that are difficult to see in real time. Depending on the signals used, such systems may incorporate movement, cardiorespiratory activity or other physiological indicators to estimate sleep states and interruptions. The technology does not eliminate the need for clinical interpretation; premature infants have unusual sleep signatures, and algorithms must be validated against expert assessment. However, automated measurement could make future studies more precise and allow hospitals to evaluate developmental-care practices without relying solely on subjective bedside impressions.
The findings also have practical implications for neonatal intensive care. SSC requires staff planning, safe positioning and attention to respiratory support, monitoring lines and the infant’s medical condition. It is not a substitute for treatment, and some infants may need to wait until they are stable enough for handling. But when clinically appropriate, the intervention can often be integrated into routine care without expensive equipment. If stable sleep is confirmed as one of its benefits, clinicians may increasingly consider the timing and duration of SSC as part of a broader sleep-protection strategy. That strategy could include reducing unnecessary noise and light, clustering care activities, avoiding avoidable interruptions and recognizing periods when an infant is settling into sustained sleep. The goal would not be to prevent all arousals—some are normal and medically necessary—but to reduce disturbances that impose stress without providing clinical benefit.
For parents, the research offers a powerful reminder that participation in intensive care is not limited to making decisions or receiving updates from clinicians. Carefully supervised physical contact may provide biological support as well as comfort, even when a baby remains connected to monitors and medical equipment. Still, the study should be interpreted within the limits of the evidence currently described. More research will be needed to determine how long the effects last, whether they differ according to gestational age or medical condition, and whether improved sleep stability leads to measurable gains in growth, brain development or later neurobehavioral outcomes. Future investigations may also compare different SSC schedules, examine the roles of mothers and fathers, and test whether automated sleep metrics can predict which infants benefit most. For now, the message is both scientifically intriguing and immediately relevant: a caregiver’s chest may serve as a remarkably effective source of warmth, rhythm and regulation for a premature brain learning how to sleep.
Subject of Research: The effects of skin-to-skin contact on sleep stability, sleep duration and sleep fragmentation in preterm infants.
Article Title: Skin-to-skin contact improves sleep stability in preterm infants.
Article References: Sottemano, S., Bos, R., De Cola, C. et al. “Skin-to-skin contact improves sleep stability in preterm infants.” Pediatric Research (2026). https://doi.org/10.1038/s41390-026-05310-y
Image Credits: AI Generated
DOI: 10.1038/s41390-026-05310-y
Keywords: preterm infants, premature birth, skin-to-skin contact, kangaroo care, infant sleep, sleep stability, sleep fragmentation, neonatal intensive care, developmental care, automated sleep analysis
