Poor sleep linked to later depression
The other study was prospective, using data from the PATCH Prenatal Care and Maternal and Child Health Outcomes study, which initially “compared health outcomes and satisfaction with prenatal care between patients receiving Centering Pregnancy group prenatal care and patients receiving traditional prenatal care,” the authors explained. This secondary analysis looked at sleep problems and postpartum depression.
“We don’t routinely ask patients about sleep or screen patients for sleeping issues,” lead author Carolyn Sinow, MD, a 4th-year resident at Kaiser Permanente Santa Clara (Calif.) Medical Center, said in an interview. “I think that we need to take sleep complaints more seriously overall, especially in early pregnancy.” While sleep problems in the third trimester often have more to do with discomforts from pregnancy itself, better sleep “in the first and second trimester is something we can really target with good sleep hygiene,” she added.
The 336 pregnant participants were recruited from Health Connect as long as they had a singleton pregnancy, were receiving prenatal care from Kaiser Permanente Northern California, and completed baseline questionnaires about their sleep and depression and anxiety symptoms during their first trimester between August 2020 and April 2021. Those with clinical depression or a high-risk pregnancy were excluded. The participants then completed the questionnaires again between 4 and 8 weeks post partum.
After adjusting for baseline depression and potential confounders, patients with poor sleep quality, indicated by a score greater than 5 on the Pittsburgh Sleep Quality Index (PSQI), were 12% more likely to develop postpartum depression, indicated by a score on the Patient Health Questionnaire depression scale (PHQ-8) of 10 or greater (relative risk, 1.12; 95% confidence interval, 1.01-1.25).
The two aspects of sleep that specifically correlated with postpartum depression were sleep quality and sleep latency, or taking a long time to fall asleep. Those reporting poor sleep quality were twice as likely to develop postpartum depression (relative risk, 2.18; 95% CI, 1.22-3.91), and those who took a while to fall asleep were 52% more likely to develop postpartum depression (RR, 1.52; 95% CI, 1.06-2.17).
Though the study also found prenatal sleep problems correlated with higher postpartum anxiety scores on the General Anxiety Disorder scale (GAD-7), the results were not statistically significant.
Kathleen Morrell, MD, MPH, an ob.gyn. in New York, was not involved in the study and said she was surprised it wasn’t something that had been studied much before because it makes sense.
“I always like it when studies confirm what we think should make sense, so it’s nice to see it,” Dr. Morrell said in an interview. “I think anytime you put something out, research it, and define it with numbers for doctors, that sometimes allows us to [realize], ‘Oh, that’s probably something we should be paying more attention to, especially if we have available treatments for it,’” she added.
“The clinical takeaway is that we really need to be screening for sleep pattern disruptions early in pregnancy, because even though it makes logical sense, it might not be something on our radar to think about,” Dr. Morrell said. “If people aren’t sleeping, well, their mental health is negatively affected.”
The most promising therapy for sleep issues currently is cognitive-behavioral therapy, which can accessed through various apps, Dr. Sinow said in an interview. “There are also safe interventions, such as melatonin and Unisom, that are totally safe in pregnancy that we can use to target sleep in early pregnancy.”
Dr. Morrell added that vitamin B6, often taken for nausea and vomiting during pregnancy, can also sometimes help people sleep and is safe during pregnancy.
“We know that postpartum depression does not necessarily only have a negative effect on the mother, but also has a negative effect on the infant and the family dynamic as well,” Dr. Morrell said. “So, we should be looking and screening for it so that we can offer people potential treatment because we know it can have long-term effects.”
Ms. Jang and Dr. Sinow did not have any disclosures. Dr. Morrell has done training for Nexplanon. Neither study noted external funding.