Author Interviews, OBGYNE / 02.02.2026
Night Sweats In Early Pregnancy: Why They Happen and How to Stay Comfortable
Editor's note: Please let your health care provider know if you are experiencing night sweats, whether you or not you are pregnant.
Experiencing night sweats early pregnancy sign symptoms can be surprising and uncomfortable, especially if you’re still waiting for that positive test or just beginning your first trimester. Many women wake up drenched, overheated, or restless during early pregnancy without realizing that this very common symptom is often linked to hormonal changes. While uncomfortable, night sweats at this stage are usually harmless and reflect your body’s rapid adjustments as pregnancy begins.
As your hormones shift, the right sleep setup can make a huge difference. A supportive maternity pillow can help regulate airflow around your body, improve sleep posture, and reduce overheating caused by restless sleep. Understanding why night sweats happen and how to manage them can help you stay comfortable and confident through these early changes.
The Hormonal Rollercoaster: Why Progesterone and Estrogen Cause Temperature Swings
Hormones are the most common reason for early pregnancy night sweats. Right after conception, your body rapidly increases its production of progesterone and estrogen, both of which directly influence your temperature regulation.
The Hormonal Rollercoaster: Why Progesterone and Estrogen Cause Temperature Swings
Hormones are the most common reason for early pregnancy night sweats. Right after conception, your body rapidly increases its production of progesterone and estrogen, both of which directly influence your temperature regulation.
Here’s how hormones trigger night sweats:
- Progesterone naturally raises body temperature
- Estrogen fluctuations affect heat sensitivity
- These hormones stimulate your metabolism
- Your body works harder to support the uterine lining
Shani Vaknine[/caption]
Shani Vaknine, Ph.D. candidate
Brain and Behavioral Sciences
The Hebrew University
MedicalResearch.com: What is the background for this study?
Response: We’ve long known that maternal stress during pregnancy can affect her baby’s development, but the molecular mechanisms behind this remained unclear. In our study, we explored how psychosocial stress experienced by the mother in late pregnancy influences tiny molecular fragments in the newborn’s blood. These fragments, called transfer RNA fragments or tRFs, were considered for many years to be disposable, but have recently been shown to have important biological functions.
Dr. Davis[/caption]
Esa M. Davis, M.D., M.P.H , F.A.A.F.P
Professor of Medicine and Family and Community Medicine
Associate Vice President of Community Health and
Senior Associate Dean of pPopulation Health and Community Medicine
University of Maryland School of Medicine
Dr. Davis joined the U.S. Preventive Services Task Force in January 2021
MedicalResearch.com: What is the background for this study? What are the main findings?
Response: Iron is important to overall health, and people need more iron when they are pregnant. This can make pregnant people at increased risk for iron deficiency, which can progress to anemia and cause complications for both moms and their babies. After reviewing the latest available research, the Task Force found that there is not enough evidence on whether pregnant people who do not have signs or symptoms of iron deficiency or anemia should be screened—or take iron supplements—to improve their health or the health of their baby. 
The pregnancy brain is often referred to as momnesia or baby brain.
Dr. Nicholson[/caption]
Wanda K. Nicholson, M.D., M.P.H., M.B.A.
Senior Associate Dean for Diversity, Equity, and Inclusion
Professor of Prevention and Community Health
Milken Institute School of Public Health
George Washington University
Vice chair of the U.S. Preventive Services Task Force
MedicalResearch.com: What is the background for this study?
Response: Neural tube defects are when a baby’s spinal cord or brain don’t develop properly during pregnancy, which can cause serious complications including disability and death. The good news is that taking folic acid supplements before and during early pregnancy is proven to help prevent this from happening.
Dr. Callaghan[/caption]
Bridget Callaghan Ph.D.
Assistant Professor of Psychology
UCLA
Dr. Callahan studies interactions between mental and physical health across development.
MedicalResearch.com: What is the background for this study?
Response: A growing body of evidence links the gut microbiome to brain and immune functioning, and changes to that community of microorganisms is likely among the ways that hardship affects children’s socioemotional development.
Limited evidence in humans has demonstrated the adversities experienced prenatally and during early life influence the composition of the gut microbiome, but no studies had examined whether stress experienced in a mother's own childhood could influence the microbiome of the next generation of children.
Dr. Fink[/caption]
Dorothy A. Fink, MD
Deputy Assistant Secretary for Women's Health
Director, Office on Women's Health
US Department of Health & Human Services
Rockville, MD
MedicalResearch.com: What is the background for this study?
Response: Delivery-related mortality in U.S. hospitals has decreased for all racial and ethnic groups, age groups, and modes of delivery while the prevalence of severe maternal mortality (SMM) increased for all patients, with higher rates for racial and ethnic minority patients of any age.
This study specifically looked at inpatient delivery-related outcomes and found a 57% decrease from 2008-2021. The decreasing mortality rates within the inpatient delivery setting demonstrated as statistically significant and a welcome finding for all women.
This study also looked with greater granularity at the impact of race, ethnicity, and age. Mortality for American Indian women decreased 92%, Asian women decreased 73%, Black women decreased 76%, Hispanic women decreased 60%, Pacific Islander women decreased 79%, and White women decreased 40% during the study period.
Dr. Miller[/caption]
Alex P. Miller, PhD
TranSTAR T32 Postdoctoral Fellow
Department of Psychiatry
Washington University School of Medicine
St. Louis, MO
MedicalResearch.com: What is the background for this study?
Response: Adolescent cannabis use is increasing in the United States. Prior research suggests that people who start using cannabis earlier are more likely to engage in problematic use and also experience greater mental health challenges and socioeconomic disadvantages overall. For example, children who begin using cannabis early are more likely to have behavioral problems and disorders and are more less likely to complete school.
In our study, we used data from the Adolescent Brain Cognitive Development (ABCD) Study, which is following nearly 12,000 kids across the nation to track behavior and brain development as well as health from middle childhood to young adulthood. We looked at what factors are associated with the initiation of cannabis use by age 12-14.
Prof. McManus[/caption]
Richard McManus MA PhD MBBS FRCGP FRCP
Professor of Primary Care
Dr. McManus chairs the Blood Pressure Monitoring Working Party
of the British Hypertension Society
Nuffield Department of Primary Care Health Sciences
MedicalResearch.com: What is the background for this study?
Response: About one in ten people who are pregnant develop high blood pressure and almost half of these go onto to have pre-eclampsia. Many pregnant women and individuals are already measuring their own blood pressure – well over half of those with high blood pressure in a recent large survey in the UK but until recently there were no data to support this.
