"Many risk factors for stillbirths are not able to be modified once pregnancy has begun. Until recently, it hasn't been on the radar for stillbirth research," O'Brien says. "Maternal sleep has been overlooked as a potential area for maternal and newborn health interventions even though it is related to many of the major, well-established risk factors for poor pregnancy outcomes. While the current study asked about maternal sleep position, not enough women reported sleeping on their backs for any meaningful analysis. The new study follows other research looking at possible ties between maternal sleep and fetal wellbeing in recent years, including studies suggesting that women who report that they sleep on their backs have an increased risk of stillbirths. Maternal sleep practices, however, cover a relatively new area of investigation. Smoking, advanced maternal age, diabetes, obesity and drug abuse are among well-established risk factors for stillbirths. is still higher than in many other Western countries Rates are even worse in low income countries but the stillbirth rate in the U.S. About half of all stillbirths happen after 28 weeks of pregnancy and many remain unexplained. Stillbirth effects about 1 in 160 pregnancies in the U.S., with about 24,000 babies stillborn in the country every year - 10 times as many deaths that occur from Sudden Infant Death Syndrome (SIDS). Understanding the role of maternal sleep may help us identify interventions that would put us in a better position to advise women." "Studies aiming to reduce stillbirths should consider maternal sleep as this is a potentially modifiable risk factor. "Our findings add to research indicating that maternal sleep plays a role in fetal wellbeing," she says. She notes that while there is already evidence that very disrupted sleep and clinical sleep disorders are associated with poor pregnancy outcomes, few studies have looked at the opposite end of the spectrum, such as long periods of undisturbed sleep Experts offer practical recommendations to deal with sleep problems during heat waves.
A mother's diet during pregnancy is linked to her child's food preferences.Efficacy and safety of monoclonal antibodies against SARS-CoV-2 during pregnancy.O'Brien also cautions that "pregnant women should not be waking themselves up at night." Very disruptive sleep has also been associated with poor pregnancy outcomes, including growth restriction and preterm growth. This is important, O'Brien says, because low blood pressure has been linked with fetal growth problems, preterm birth, and stillbirth. It's possible that these brief increases in blood pressure are able to prevent long periods of relatively low pressure. She notes that blood pressure reaches its lowest point during sleep but when someone is awakened, there is a surge in the nervous system activity that causes transient increases in blood pressure. O'Brien says further studies need to delve deeper into what may drive the relationship between maternal sleep and stillbirths, with particular focus on how the autonomic nervous system - the control system that regulates bodily function - and the hormonal system are regulated during sleep in late pregnancy. "While multiple awakenings during the night may concern some women, in the context of stillbirth it appears to be protective." "Pregnant women often report waking up and getting up in the middle of the night," says lead author Louise O'Brien, Ph.D., M.S., a University of Michigan researcher in the Division of Sleep Medicine, Department of Neurology and the Department of Obstetrics and Gynecology at Michigan Medicine. But researchers caution that further research is needed to better understand the relationship and what it means for pregnant women. The findings, which appear in journal Birth, suggest an association between lengthy periods of undisturbed maternal sleep and stillbirths that were independent of other risk factors. Researchers analyzed online surveys involving 153 women who had experienced a late stillbirth (on or after 28 weeks of pregnancy) within the previous month and 480 women with an ongoing third-trimester pregnancy or who had recently delivered a live born baby during the same period. Sleeping more than nine hours per night during pregnancy may be associated with late stillbirth, a new Michigan Medicine-led international study suggests. Researchers explore how maternal sleep habits, including lengthy periods of sleep without waking more than once in the night, may be associated with fetal health
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