Pregnancy Insomnia: Why It Happens and What to Do

Q: Is pregnancy insomnia normal?

Yes, extremely. Research suggests up to 75 percent of women experience significant sleep disruption in the third trimester. It is one of the most common pregnancy complaints and one of the most underreported at antenatal appointments because women assume it is inevitable. Many of its specific causes are addressable, and getting support for it is entirely appropriate.

Q: What causes pregnancy insomnia in the first trimester?

First trimester insomnia is most commonly driven by anxiety about the pregnancy, the hormonal changes of early pregnancy affecting sleep architecture, nausea that worsens when lying down, and the general psychological adjustment to being pregnant. Physical discomfort is a less significant factor this early but increases in relevance from the second trimester onwards.

Q: What is the safest way to treat insomnia during pregnancy?

Cognitive behavioural therapy for insomnia is the most evidence-based and safest treatment during pregnancy. It addresses both the behavioural patterns and the thinking that maintains insomnia. Physical causes should be addressed specifically, such as hip pain through positional support and heartburn through dietary and positional changes. Sleep medication during pregnancy should be discussed with your GP rather than self-prescribed.

Q: Why does pregnancy insomnia get worse in the third trimester?

Because the number of overlapping causes increases simultaneously. Physical discomfort from hip and pelvic pain, heartburn, frequent urination, shortness of breath, Braxton Hicks contractions, and fetal movement all peak in the third trimester. Anxiety about approaching birth and the mental load of preparation adds a psychological layer. The combination of physical and psychological drivers at their highest simultaneously is why third trimester insomnia is typically the most severe.

Q: Will pregnancy insomnia harm my baby?

Significant sleep deprivation in pregnancy is associated with some adverse outcomes including increased risk of preterm birth and longer labours, which is one reason addressing pregnancy insomnia matters rather than simply enduring it. Mild to moderate disruption, while difficult for you, does not carry the same risks. Managing the specific causes of your insomnia is the appropriate response rather than worrying about the insomnia itself adding risk.

Pregnancy insomnia affects most women at some point across the nine months. Here's what's actually driving it at each stage and what the evidence says about getting relief.

May 31, 2026 10 min read

regnant woman lying awake in bed at night experiencing pregnancy insomnia in dim light

In this article

Pregnancy is exhausting. The irony is that being exhausted does not guarantee sleep. Many pregnant women find themselves lying awake at 2am, 3am, or 4am — too tired to function, too uncomfortable or too mentally active to sleep — in a cycle that compounds itself night after night.

Pregnancy insomnia is not a single condition. It is a collection of overlapping causes that each require their own management strategy. Understanding which causes are driving your specific sleep disruption is more useful than applying generic sleep advice, because the fix for a racing anxious mind is different from the fix for hip pain that wakes you every hour, which is different again from the heartburn that arrives the moment you lie flat.

This guide covers all of them.

What pregnancy insomnia actually is

Insomnia is defined as difficulty falling asleep, difficulty staying asleep, or waking too early and being unable to return to sleep — with those difficulties occurring at least three nights per week and causing significant daytime impairment.

By that definition, a substantial proportion of pregnant women experience clinical insomnia at some point in their pregnancy. Research suggests rates of 60 to 75 percent in the third trimester specifically. That is not a niche problem — it is the near-universal experience of late pregnancy, and it is one of the most consistently underreported symptoms at antenatal appointments because women assume it is simply part of pregnancy rather than something that can be addressed.

It can be addressed. Not perfectly, not always completely, but meaningfully. The starting point is identifying which of the following causes are relevant to your situation.

The physical causes

Hip and pelvic pain

This is the most common physical cause of pregnancy insomnia from the second trimester onwards and the one most directly and quickly addressable. When you lie on your side without adequate support, your top hip drops forward under gravity, loading your hip joints and lower back unevenly. The pain builds over forty to sixty minutes and wakes you. You roll to the other side. That hip starts building. The cycle repeats three or four times per night.

This is a setup problem rather than an inevitable consequence of pregnancy. Support under your bump, between your knees, and behind your lower back addresses the three zones that drive the discomfort. The Bumpnest Maternity Pillow is designed around exactly this — a modular three-piece system with an organic cotton cover that supports each zone independently so the support stays in place when you roll rather than shifting away and leaving you without it.

Heartburn and reflux

Lying flat removes the gravitational advantage that keeps stomach acid down during the day. Progesterone relaxes the lower oesophageal sphincter. Your growing uterus compresses the stomach upward. The result is heartburn that arrives at bedtime and worsens through the night.

Elevating the head of the bed by ten to fifteen centimetres is the most effective physical intervention. Eating your last meal at least two hours before bed, keeping it small and low in fat and acid, and avoiding lying down immediately after eating reduces the frequency of episodes. Safe over-the-counter antacids are available at Australian chemists — speak with your GP or pharmacist before starting any new medication during pregnancy.

Frequent urination

Your bladder has significantly less capacity in the third trimester as your baby's head presses against it. Most third trimester women make one to three bathroom trips per night. Each trip is a full awakening that takes time to recover from.

Front-loading fluids earlier in the day and tapering off in the two hours before bed reduces frequency without compromising hydration. Emptying your bladder fully immediately before getting into bed reduces the likelihood of waking within the first hour.

Restless legs syndrome

A persistent urge to move the legs, usually accompanied by an uncomfortable crawling or tingling sensation, that is worse at rest and at night. Restless legs syndrome affects around 20 to 25 percent of pregnant women and is one of the more disruptive causes of sleep-onset insomnia — the difficulty of falling asleep rather than staying asleep.

It is associated with iron deficiency and folate deficiency in pregnancy. If you are experiencing restless legs symptoms, ask your GP or midwife to check your iron and folate levels at your next appointment. Magnesium supplementation has reasonable evidence for reducing symptoms — speak with your midwife before starting. Gentle leg stretching and walking before bed helps some women. Caffeine and antihistamines can worsen symptoms.

Shortness of breath

In the third trimester, the uterus pushes upward against the diaphragm, reducing lung capacity. Many women find that lying flat makes them feel breathless, which is uncomfortable enough to prevent sleep onset or cause waking. Sleeping with the head of the bed slightly elevated addresses this alongside heartburn. Propping yourself with a firm wedge under the upper body creates a semi-reclined position that many women find considerably more comfortable.

Physical discomfort generally

The combination of a large and heavy bump, Braxton Hicks contractions, fetal movement during overnight hours, and the general physical demand of third trimester pregnancy creates a level of physical distraction that makes the relaxed body state required for sleep harder to achieve. Not all of this is fixable, but reducing the addressable components — pain, heartburn, temperature — reduces the total discomfort load enough to make sleep possible.

The psychological causes

Anxiety about the pregnancy

Worry about the baby's health, about labour, about becoming a parent, about finances, about how everything is about to change — these are not irrational concerns, they are genuine uncertainties that a growing pregnancy makes vivid and immediate. For women who are already prone to anxiety, pregnancy amplifies it. For women who were not previously anxious, pregnancy sometimes triggers it for the first time.

Anxiety activates the sympathetic nervous system, raising cortisol and adrenaline in ways that directly oppose sleep. A mind that is running through scenarios, making mental lists, or catastrophising is a mind that cannot produce the physiological state required for sleep onset. The harder you try to sleep in this state, the more activated you become.

If anxiety is significantly affecting your sleep, it warrants professional support rather than just sleep strategies. Speak with your GP or midwife. Antenatal anxiety affects around one in five Australian women and responds well to psychological treatment. PANDA on 1300 726 306 is available if you want to talk through what you're experiencing before a formal appointment.

Racing mind and active thinking

Even without clinical anxiety, pregnancy brings a mental load that is hard to set down at bedtime. The preparation, the planning, the worrying about preparation and planning — the third trimester in particular tends to produce a busy, active mind at exactly the time you need it to quiet.

The most evidence-based intervention for this is keeping a brief written download before bed — not a journal, not a reflection, just a note of whatever is cycling through your mind. Tasks, worries, things you need to do, things you are afraid of forgetting. Getting them out of your head and onto paper allows your brain to release the holding pattern it's maintaining to keep track of them. It takes five minutes and produces a measurable reduction in sleep-onset time.

Conditioned waking

If you have been waking at the same time every night for several weeks, your body begins to anticipate that waking and produce a partial arousal before it happens. This is called conditioned waking and it perpetuates insomnia even when the original trigger — pain, a bathroom trip, anxiety — has been addressed or reduced.

Breaking conditioned waking requires stimulus control: keeping the bed associated with sleep rather than with wakefulness. If you wake and cannot return to sleep within twenty minutes, getting up briefly, doing something calm in low light, and returning to bed when you feel sleepy again is more effective than lying awake in bed accumulating frustration. Counter-intuitive but consistently supported by sleep research.

Sleep anxiety

Many women with pregnancy insomnia develop secondary anxiety about sleep itself. The awareness that you are not sleeping, the calculation of how many hours remain before you need to get up, the catastrophising about how tired you will be tomorrow — this secondary anxiety is often more disruptive than the original cause of the waking.

Removing the clock from your bedroom, or placing your phone face-down out of reach, breaks the time-checking behaviour that feeds this. Sleep in fragments is physiologically restorative even when it doesn't feel that way. Reframing broken sleep as rest rather than failure reduces the activation that prevents return to sleep.

Cognitive behavioural therapy for insomnia

CBT-I — cognitive behavioural therapy specifically adapted for insomnia — is the most evidence-based treatment for insomnia available, and it is safe during pregnancy. It addresses both the behavioural patterns and the thoughts that maintain insomnia rather than just managing symptoms.

CBT-I techniques include sleep restriction therapy, which consolidates sleep drive; stimulus control, which re-associates the bed with sleep; and cognitive restructuring, which challenges the unhelpful beliefs about sleep that maintain the anxiety cycle. A clinical psychologist with sleep specialisation can deliver CBT-I formally, and several digital CBT-I programs are available in Australia for self-guided use.

If pregnancy insomnia is significantly affecting your daily function, your mood, or your ability to manage work and daily life, asking your GP for a referral to a psychologist under a Mental Health Care Plan is worthwhile. You do not need to have a pre-existing mental health condition to access this support.

Sleep medication during pregnancy

Most sleep medications including benzodiazepines and z-drugs are not recommended during pregnancy due to potential effects on the developing baby. Melatonin is widely used for sleep outside of pregnancy but does not have sufficient safety data in pregnancy for routine recommendation in Australia.

Some antihistamine medications with sedating properties are used short-term in pregnancy for specific indications, but their use for insomnia should be discussed with your GP rather than self-managed.

The most important message here is not to self-prescribe sleep medication during pregnancy without medical guidance. If you are considering medication for pregnancy insomnia, the conversation with your GP will help you understand what is available, what the evidence says about safety, and whether the benefits outweigh the risks in your specific situation.

Building a sleep environment that reduces insomnia

Beyond addressing the specific causes above, the sleep environment itself either supports or undermines your ability to sleep. The key elements for pregnancy specifically are covered in detail in our [how to build the perfect pregnancy sleep setup] guide, but the summary is straightforward.

A room temperature of around 18 to 20 degrees, erring cooler. Complete darkness using blackout curtains or a sleep mask. A consistent wind-down routine that signals sleep approach. A properly supported sleep position that removes physical pain as a waking trigger. A phone out of reach rather than beside the bed.

None of these individually solves pregnancy insomnia. Together they reduce the total load of sleep-disrupting factors enough that your body's own sleep drive can do the rest.

When to speak with your care team

Pregnancy insomnia that is significantly affecting your mood, your ability to function during the day, your relationship, or your mental health warrants a conversation with your GP or midwife. This is not a complaint to minimise or manage through — it is a legitimate health concern that affects your wellbeing and your pregnancy.

Specific symptoms that warrant prompt discussion include severe anxiety that is preventing sleep onset most nights, restless legs symptoms that haven't responded to basic measures, heartburn that isn't controlled with dietary changes and over-the-counter antacids, and any mood symptoms including persistent low mood, tearfulness, or hopelessness that accompany the insomnia.