Most pregnancies come with broken nights.
The bump, the heartburn, the trips to the bathroom pile up, and sleep rarely feels like your own again. For a long time, that was seen as a passing nuisance of pregnancy.
That picture is shifting. The National Institutes of Health is gathering researchers in Bethesda, Maryland, from October 14 to 16, 2026, for a conference devoted to sleep and women's health.
One of the stated themes is that sleep problems during pregnancy may have lasting effects on both mothers and their children.
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A growing body of peer-reviewed research backs that framing.
In a study of 148 mother-infant pairs published in Developmental Science, researchers at Washington University in St. Louis tracked maternal sleep across pregnancy with wrist-worn monitors.
Then they imaged the newborns' brains in the first weeks of life.
Infants whose mothers had the most irregular sleep from day to day showed smaller volumes of gray and white matter in the brain's outer layer, along with less cortical surface area.
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Later bedtimes and a mismatch between a mother's body clock and her sleep schedule were linked to smaller deep-brain gray matter.
Short nights were tied to toddler milestones
A newborn brain scan does not tell you how a child will develop. For that you need to follow children for years.
A larger prospective cohort of 7,059 mother-child pairs in China did exactly that. The results were published in the Journal of Clinical Endocrinology & Metabolism in September 2024.
When mothers slept less than seven hours a night in midpregnancy, the risk of a neurodevelopmental delay was higher in their children.
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That means being slower to reach the usual milestones for social, motor, cognitive or speech skills. Boys were more vulnerable than girls.
The authors pointed to maternal glucose metabolism as one plausible pathway.
Short sleep may nudge blood sugar in ways that affect how the fetus develops. Cord blood markers of fetal insulin tracked with the later delays.
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None of this means a single bad week will harm a baby. The researchers are describing patterns across pregnancies, not fates for individual nights.
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But the direction is consistent enough that doctors increasingly treat sleep as part of prenatal care.
The usual advice applies, with a few pregnancy-specific tweaks.
Keep the bedroom cool and dark. Use the bed only for sleep. Put phones and tablets away in the hour before bedtime.
If you are awake for more than 20 minutes, get out of bed and do something quiet in low light before trying again. That helps the brain unlink the bed from frustration.
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Loud snoring, choking at night or heavy daytime sleepiness are worth raising with your doctor. They can be signs of sleep-disordered breathing, which has its own links to pregnancy complications and to how a child develops.
Earlier evidence has also tied poor sleep in the last weeks of pregnancy to a higher risk of obesity in the child by age two.
The NIH conference runs October 14 to 16, 2026, at the Natcher Conference Center on the Bethesda campus, with maternal and fetal health on the program.
This article is made and published by Ida-Marie Palm Varbæk, who may have used AI in the preparation.