Most new mothers expect terrible sleep after their baby arrives. The advice they get — from friends, family, social media, and even some healthcare providers — amounts to a collective shrug: sleepless nights are inevitable, so brace yourself.
A new study suggests that message is not just unhelpful but actively harmful. Pregnant women who expected severe sleep disruption after birth went on to experience worse sleep quality than those who held more balanced expectations — even after accounting for psychiatric history, prior sleep disorders, and the number of previous births.
The findings, presented June 15 at the SLEEP 2026 annual meeting in Baltimore and published in an online supplement of the journal Sleep, point to a cognitive mechanism that may be compounding the biological sleep disruption of early parenthood.
What the Study Found
Researchers enrolled 432 pregnant women at approximately 24 weeks of gestation. At enrollment, participants completed validated measures of sleep expectations, current sleep quality (using the Pittsburgh Sleep Quality Index), and mood (using standardized depression and anxiety scales). Follow-up assessments were repeated at six, 12, and 24 weeks postpartum. A subset of 49 women also wore wrist actigraphy devices at six to eight weeks after delivery to provide objective sleep measurements.
The headline finding: 70% of participants — 301 of 432 women — expected poor sleep in the postpartum period. Those expectations were a significant predictor of actual postpartum sleep quality, outperforming variables that clinicians might assume matter more.
Prior sleep disorders, psychiatric history, and parity (whether a woman had given birth before) all had weaker associations with postpartum sleep outcomes than the women's own beliefs about how badly they would sleep.
The Nocebo Effect of Sleep Anxiety
The mechanism likely involves what psychologists call anticipatory hypervigilance. When a person expects sleep disruption, they enter the nighttime primed for threat — monitoring every sound, every movement, every internal sensation for signs of wakefulness. This heightened arousal state makes it harder to fall back asleep after nighttime awakenings, which are inevitable with a newborn but do not have to spiral into chronic insomnia.
Structural sleep disruption affects 60% to 80% of postpartum women, and poor maternal sleep is a well-established risk factor for postpartum depression and anxiety. What this study adds is evidence that part of the damage may be self-inflicted — not through any fault of the mother, but through a cultural narrative that treats catastrophic sleep loss as an unavoidable feature of new parenthood.
A Prenatal Window for Intervention
The most actionable implication is the timing. The researchers assessed expectations at 24 weeks of gestation — solidly in the second trimester, well before delivery. At that point, beliefs about postpartum sleep are already formed but potentially modifiable.
Sleep-related beliefs are among the most responsive targets in cognitive behavioral therapy for insomnia (CBT-I). Techniques like cognitive restructuring — identifying and reframing catastrophic thoughts about sleep — have strong evidence in the general insomnia population. Adapting these techniques for prenatal care would not require inventing a new therapy, only deploying an existing one earlier and in a different clinical context.
Several research groups are already working on this. A randomized controlled trial at the AASM Foundation is testing digital CBT-I delivered during pregnancy, with postpartum depression symptoms as the primary outcome. Other trials are evaluating whether addressing perinatal insomnia can reduce the downstream cascade of mood disorders, impaired bonding, and reduced breastfeeding.
What Obstetricians Can Do Now
The study's authors note that obstetricians and midwives already have a natural touchpoint at the 24-week prenatal visit. A brief conversation about realistic sleep expectations — acknowledging that nighttime awakenings are normal while challenging the belief that months of extreme sleep deprivation are inevitable — could function as a low-cost, low-risk intervention.
More structured approaches might include screening for catastrophic sleep beliefs using brief validated questionnaires, then referring high-risk women to digital or group-based CBT-I programs that are increasingly available through health systems.
What This Means for Patients
If you are pregnant and dreading postpartum sleep, this study offers a counterintuitive form of reassurance: the dread itself may be part of the problem, and it is something you can work on before the baby arrives. Nighttime awakenings with a newborn are real and unavoidable, but the belief that you will be destroyed by them is not a fact — it is a prediction, and predictions can be revised. Talk to your obstetrician or midwife about your sleep concerns during a second-trimester visit. If anxiety about postpartum sleep is already affecting your rest, ask about cognitive behavioral approaches that can help before delivery, not just after.
