Summary: A new study identifies a powerful psychological predictor of maternal sleep health: a pregnant woman’s expectations about postpartum sleep strongly forecast her actual sleep disruption after birth. These expectations predict outcomes even more than prior sleep problems, number of previous births, or past psychiatric diagnoses.
In a prospective study tracking 432 women from mid-pregnancy through 24 weeks postpartum, researchers combined validated self-report measures with objective wrist actigraphy to examine how prenatal beliefs, mood, and objective sleep interact. The findings reveal that negative prenatal sleep expectations and postpartum anxiety interact in a feedback loop that measurably worsens objective sleep quality for many new mothers.
Key Findings
- Expectations outweigh history: A pregnant woman’s subjective expectation of poor sleep was the strongest predictor of postpartum insomnia and sleep fragmentation, outperforming established risk factors such as prior clinical sleep disorders, previous psychiatric diagnoses, or parity (number of births).
- Widespread negative expectations: Of the 432 participants enrolled around 24 weeks’ gestation, 70% (301 women) reported expecting poor postpartum sleep, suggesting a widespread belief that significant sleep loss is unavoidable after childbirth.
- Objective validation with actigraphy: To limit bias from mood-driven self-reporting, a subgroup of 49 first-time mothers wore wrist actigraphs at 6–8 weeks postpartum. Objective measures of nighttime movement and awakenings aligned with the subjective reports: women who anticipated the worst sleep displayed more nighttime movement and wakefulness.
- Postpartum anxiety amplifies effects: While prenatal anxiety levels were not strongly predictive, acute anxiety after delivery markedly worsened both subjective and actigraphy-measured sleep for women who had expected poor sleep.
- Public-health implications: Professional guidelines note that 60%–80% of postpartum women experience sleep disruption, which increases the risk for postpartum depression and anxiety. Yet sleep disturbance is often treated as an inevitable part of new parenthood rather than a target for prevention.
- Opportunity for prenatal intervention: Because sleep-related beliefs are modifiable, the prenatal period—around 24 weeks’ gestation—may offer an important window for cognitive interventions led by obstetric and midwifery teams to reduce later sleep disruption and protect maternal mental health.
Source: AASM
Study overview
The study, to be presented at the SLEEP 2026 annual meeting, evaluated how prenatal expectations about postpartum sleep relate to later sleep outcomes. Participants completed standardized measures of beliefs about postpartum sleep, current sleep quality using the Pittsburgh Sleep Quality Index, and mood with validated depression and anxiety scales. Assessments occurred at enrollment (~24 weeks’ gestation) and again at 6, 12, and 24 weeks postpartum. The actigraphy subgroup provided objective sleep data at 6–8 weeks postpartum.
Among first-time mothers without prior health concerns, those who expected substantial sleep disturbance experienced significantly more disrupted sleep postpartum, assessed both subjectively and with actigraphy. Moreover, higher levels of anxiety after birth further degraded sleep for women who had anticipated poor sleep, irrespective of their prenatal anxiety scores.
“Most pregnant women in our sample anticipated poor postpartum sleep before it occurred, and it was striking that those expectations predicted worse sleep outcomes even when controlling for prior sleep disorders, psychiatric history, and parity,” said lead author Sammy Dhaliwal, a clinical health psychologist and research fellow in the Department of Obstetrics & Gynecology at the Perelman School of Medicine, University of Pennsylvania. “This points to attitudes and beliefs about sleep during pregnancy as a potentially modifiable target for early intervention.”
The American Academy of Sleep Medicine emphasizes that healthy sleep depends on adequate duration, quality, timing, and the absence of disorders. Sleep disruption affects a majority of postpartum women and is linked to elevated risk for depression and anxiety, yet it is frequently treated as an unavoidable stage of new parenthood rather than a prevention target.
Based on these results, the research team highlights two practical intervention targets: (1) addressing and reshaping negative sleep-related beliefs during pregnancy, and (2) identifying and treating postpartum anxiety promptly. Implementing cognitive strategies and anxiety management within prenatal and postpartum care could reduce the severity of postpartum sleep loss and improve emotional well-being for new mothers.
Funding: The research was supported by grants from the National Institutes of Health. The abstract was published in an online supplement of the journal Sleep and will be presented on June 15 at SLEEP 2026 in Baltimore.
Key Questions Answered:
A: Expecting severe sleep disruption can create anticipatory stress and a state of heightened vigilance. When the infant awakens, a mother with this mindset may shift into higher physiological arousal, making it harder to return to restorative sleep and turning a normal nighttime interruption into prolonged wakefulness.
A: Actigraphy uses a wrist-worn sensor to record movement and rest-activity cycles continuously. Including actigraphy allowed researchers to confirm that reported sleep problems corresponded to measurable changes in sleep patterns, rather than reflecting only subjective perception.
A: No. Newborns do disrupt sleep; that is a physical reality. The study shows that maternal beliefs and anxiety significantly modulate how those disruptions affect sleep quality. Identifying and modifying these beliefs during pregnancy creates an opportunity to reduce the impact of sleep loss on maternal mental health.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by staff.
About this sleep research news
Author: Hannah Miller
Source: AASM
Contact: Hannah Miller – AASM
Image credit: Neuroscience News
Original Research: Findings to be presented at SLEEP 2026