Insomnia During Pregnancy: Why It Happens and What's Actually Safe to Try

Written by the Nuvirox Research Team

Short answer: yes, it’s extremely common, and most of the sleep aids people reach for outside pregnancy aren’t the right first move here. Depending on the study and trimester, somewhere between 25% and 77% of pregnant women report meaningful insomnia symptoms, with a commonly cited range of 40–60% across pregnancy overall. It is driven by a real mix of physical, hormonal, and psychological changes — not something you're doing wrong. The treatment with the best trial support, cognitive behavioral therapy for insomnia (CBT-I), doesn't involve a pill or a supplement at all.

Why does pregnancy wreck sleep so consistently?

Each trimester tends to disrupt sleep through a different mechanism. Early on, rising progesterone and morning sickness fragment sleep and increase daytime sleepiness. By the second trimester, sleep often stabilizes somewhat. The third trimester is usually the roughest: physical discomfort, frequent urination, fetal movement, reflux, and difficulty finding a comfortable position all converge. Anxiety about labor and the transition to parenthood adds a cognitive layer on top of the physical one.

Is it just normal discomfort, or is it “insomnia disorder”?

There's a meaningful line here. Poor sleep during pregnancy is common and often considered a typical part of pregnancy. But when trouble falling or staying asleep causes real distress and daytime impairment, researchers classify that as insomnia disorder — something that doesn't reliably resolve on its own and is worth addressing rather than waiting out. Roughly half of women with clinically significant insomnia symptoms during pregnancy still have them two years postpartum if untreated, which is one reason sleep researchers now push back on the idea that it's something to just tough through.

What does the trial evidence actually support?

CBT-I delivered during pregnancy. A randomized, three-site controlled trial assigned pregnant women meeting criteria for insomnia disorder to either CBT-I or a control intervention using imagery exercises. CBT-I is the same first-line, non-drug insomnia treatment recommended for the general adult population, adapted here for pregnancy-specific triggers like physical discomfort and labor anxiety.

Telehealth and mindfulness variants. A newer randomized controlled trial (N=160) tested a six-week digital mindfulness-based intervention against standardized prenatal care alone for women with subthreshold-to-clinical insomnia symptoms, tracking outcomes through six weeks postpartum. Other trials have combined CBT-I with mindfulness techniques specifically to address the racing, anticipatory thoughts common in late pregnancy.

The honest limitation. Even with CBT-I, remission rates in pregnant populations have ranged from roughly 35% to 64% across trials — meaningfully lower than the 70%+ remission often seen in general-population insomnia trials. Pregnancy-specific physical discomfort (a full bladder, a kicking fetus) is harder to talk yourself out of than purely cognitive insomnia triggers, and no behavioral or pharmacological intervention fully solves that.

Physical activity. A randomized controlled trial (the Walking_Preg project) tested structured walking during the third trimester specifically as an insomnia-prevention strategy, using pedometer-tracked step goals. It's a lower-cost, lower-risk intervention worth knowing about even though its effect sizes are more modest than CBT-I's.

What about melatonin or other supplements?

This is the part where we have to be direct: melatonin has not been established as safe for use during pregnancy in controlled human trials, and the same caution applies to most of the herbal ingredients found in over-the-counter sleep blends, including valerian, passionflower, and high-dose 5-HTP. The absence of evidence of harm is not the same as evidence of safety, and pregnancy is exactly the context where that distinction matters most. This is a decision to make with your OB or midwife, not from a blog post — and it's genuinely not a place where we think a supplement is the right starting point.

What actually helps, practically

• Left-side sleeping in the second and third trimester, which is commonly recommended for circulation and can reduce reflux-related waking.
• A wedge or pregnancy pillow to relieve hip and back pressure, which trial participants in behavioral sleep studies often cite as helpful.
• Front-loading fluids earlier in the day to reduce nighttime bathroom trips, without restricting total hydration.
• CBT-I techniques — stimulus control (only using the bed for sleep) and worry-postponement journaling — which show up across most of the trials above.
• Talking to your care provider before starting any sleep aid, prescription or otherwise.

When it's worth flagging to your provider sooner rather than later

Insomnia during pregnancy is also linked, in observational data, to higher rates of perinatal depression and, per some pooled analyses, to pregnancy complications like gestational hypertension. That's not meant to alarm you — it's meant to explain why sleep researchers increasingly argue this shouldn't be dismissed as a normal, ignorable symptom. If sleep problems are paired with persistent low mood, anxiety that won't quiet down, or symptoms like severe swelling or headaches, bring it up with your OB promptly rather than waiting for a routine appointment.

Frequently asked questions

Is insomnia during pregnancy a sign something is wrong with the baby?

No. Insomnia during pregnancy is extremely common and, on its own, is not a marker of fetal health problems. It's driven by hormonal, physical, and psychological changes in the pregnant body. That said, persistent insomnia paired with other symptoms is worth mentioning to your provider.

Is it safe to take melatonin while pregnant?

This hasn't been established in controlled human trials, and most clinicians recommend avoiding melatonin and most herbal sleep supplements during pregnancy unless specifically cleared by your OB or midwife. Non-drug approaches like CBT-I have the strongest evidence base for this population.

Why does my sleep get worse specifically in the third trimester?

Physical discomfort (from a growing belly and reduced mobility), more frequent urination, fetal movement, reflux, and often rising anxiety about labor all cluster in the third trimester, which is why prevalence estimates for insomnia tend to be highest there.

Does pregnancy insomnia go away after the baby is born?

Not automatically. Research following women 2 years postpartum found roughly half of those with clinically significant insomnia during pregnancy still had symptoms at that point, which is one reason clinicians increasingly treat it during pregnancy rather than assuming it will resolve on its own.

A note on this topic: this is a situation where the right next step is medical guidance, not a supplement. We're including this section for completeness, but please don't treat it as a substitute for talking to a clinician who knows your history.

From Nuvirox

Why we formulated Sleep+ Restore

We’re not going to pitch Sleep+ Restore for pregnancy insomnia. It contains 10 mg of melatonin along with ashwagandha and other botanicals whose safety during pregnancy hasn’t been established in controlled trials, and this is a situation where the evidence-backed first step — CBT-I, discussed with your OB or midwife — doesn’t involve a supplement at all. If you’re past pregnancy and postpartum sleep is the issue, that's a conversation worth having with your provider too before adding anything new.

Learn more about Sleep+ Restore →

The bottom line

Insomnia during pregnancy is common, real, and usually explainable by the trimester you're in — it isn't a personal failure to relax. The evidence-backed first step is behavioral, not pharmacological: CBT-I, adapted for pregnancy, has the best trial support of anything tested so far, even though it doesn't fix everything. Supplements, including melatonin, are not the place to start here; that's a conversation for your OB or midwife.

References

1. Sedov ID, et al. Cognitive Behavioral Therapy for Prenatal Insomnia: A Randomized Controlled Trial. Obstet Gynecol. PMCID: PMC6485299.
2. Evaluating the global prevalence of insomnia during pregnancy through standardized questionnaires and diagnostic criteria: a systematic review and meta-analysis. Front Psychiatry. 2024. PMCID: PMC11348333.
3. Effectiveness and Mechanisms of a Digital Mindfulness-Based Intervention for Subthreshold to Clinical Insomnia Symptoms in Pregnant Women: Randomized Controlled Trial. PMCID: PMC12089866.
4. Amezcua-Prieto C, et al. Walking in pregnancy and prevention of insomnia in third trimester using pedometers: study protocol of Walking_Preg project (WPP), a randomized controlled trial. BMC Pregnancy Childbirth. 2020;20:521. doi:10.1186/s12884-020-03225-y.
5. Sleeping for two: a randomized controlled trial of cognitive behavioural therapy for insomnia (CBTI) delivered in pregnancy and secondary impacts on symptoms of postpartum depression. ScienceDirect, 2024.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.