Postnatal insomnia: when you can't sleep even when the baby does

The baby is finally asleep. The house is dark. You have been waiting for this window all day, and now you are lying there wide awake, listening.

Or it is 3am, the feed is done, everyone around you has slipped back under, and you are staring at the ceiling doing the maths on how many hours are left.

If that is you, this post is for you. My heart goes out to anyone who cannot sleep in the postnatal period. I have come to this topic twice over: as a clinical psychologist with a special interest in perinatal mental health and insomnia, and as a mother who has lain awake while the rest of the house slept.

Postnatal sleeplessness is more common and more treatable than most of us believe. This post covers some reasons why insomnia shows up in the postnatal period, and some strategies worth trying. They are based on what the research says, what helps in clinical practice, and what I'd tell my younger self if I could.

I am putting together a full-length guide on sleep in the postnatal period. If this would be useful, you can join the waitlist here and I'll let you know the moment it's ready.

Two different problems that feel the same

In early parenting, broken sleep is a feature of the situation. Babies wake to feed and for comfort, your sleep is fragmented, and in many cases there is little we can do to control this.

A quick word on the baby, because it is its own vast subject. Many babies keep waking through the night well into the first year, and some beyond. This is normal. A baby who sleeps through early is the lucky exception, and it is not a report card on your parenting. There are various approaches to encourage more consolidated infant sleep, and they are worth their own conversation. But this post is for a specific reader: the mother who finds that, whatever her baby is doing, she herself is the one who cannot fall or return to sleep.

Insomnia is a different experience. Insomnia is when the opportunity to sleep is there and your brain declines it. The baby is asleep, or someone else is on duty, and you still cannot drop off, or you wake at 3am after a feed and lie there for two hours while everyone else in the house breathes slowly around you.

Here is the simplest way to tell them apart. Ask yourself: when I genuinely have the chance to sleep, do I? If the answer is yes, and you are exhausted purely because the chances are few, that is sleep deprivation, and the work is practical and logistical. If the answer is no, something has shifted in the system that produces your sleep, and that is worth understanding, because it responds well to treatment.

How normal disruption converts into insomnia

Postnatal insomnia rarely arrives out of nowhere. It usually grows out of ordinary, sensible adaptations that overstay their welcome.

Your brain is standing guard. New mothers sleep with one ear open. This is hypervigilance, and it's adaptive: being responsive to a baby overnight helps to keep them fed and safe. Your brain has learned this particular baby, and it wakes more readily to your infant's cry than to any other sound in the house. (Worth knowing, since it gets sold as proof of a uniquely maternal instinct: the research shows fathers and other primary carers develop the same finely tuned response, and the thing that predicts it is time spent with the baby, not who gave birth. The guard is trainable, which matters later when we talk about handovers.)

The trouble starts when the monitoring system stays switched on even when it is not your shift, or when the baby starts sleeping longer stretches and your brain has not received the memo. Standing guard for the sound of your baby is incompatible with a smooth descent into deep sleep. If you find yourself bracing to hear breathing, checking the monitor, or surfacing at every rustle even when your partner is on duty, the guard has not clocked off.

Your whole system is depleted. Hypervigilance is worse on an empty tank. An unsettled baby, thin support, and no real chance to rest during the day leave the nervous system in a state of low-grade hyperarousal, wired and exhausted at once. This is not a character flaw or a failure to relax. It is what a body does when it has been on alert for weeks without relief, and it makes the drop into sleep harder even when the chance is finally there.

Trying harder makes it worse. When sleep becomes scarce, it becomes precious, and when it becomes precious, people start working at it. Going to bed early to "bank" sleep. Lying very still and willing yourself under. Calculating how many hours remain before the next feed. Sleep researchers call this sleep effort, and it reliably backfires, because sleep is a process you permit rather than perform. The 3am maths is the classic tell. If you are watching the clock and running the numbers, you are working, and a working brain does not sleep.

Going to bed too early drains the pressure. This one catches almost everyone. The advice to "sleep when the baby sleeps" has a hidden cost: if you climb into bed at 7.30pm without enough waking hours behind you, you have not built enough sleep pressure to hold you under. The same trap has a morning version, where you take a long sleep-in after your partner does the early shift, which feels merciful but weakens the pressure you need for the next night. Either way you fall asleep briefly, then surface, then lie awake frustrated, and the bed starts to become a place where frustration happens.

The bed learns the wrong lesson. Enough nights of lying awake, worrying, feeding, scrolling, and clock-watching in bed, and the bed itself becomes a cue for wakefulness rather than sleep. This is conditioned arousal, and it is the engine of most persistent insomnia, postnatal or otherwise. It explains the maddening experience of feeling desperately sleepy on the couch and then pinging awake the moment your head hits the pillow.

Your daily anchors have dissolved. Before the baby, your body clock was held in place by regular wake times, meals, light, movement, and a commute or a routine. Postnatally, days and nights blur, you may barely see morning light, and meals happen whenever they happen. A body clock with nothing to anchor to produces shallower, less predictable sleep. You do not need a rigid schedule. You need two or three fixed points, and morning light is the cheapest and most powerful of them.

If you want to know more about why these factors lead to sleep disruption and how to resolve them, this is exactly what my full guide will cover.

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Where your effort is best spent

Catch the first stretch, and spend the run-up well. Your deepest, most restorative sleep is concentrated in the first one to two cycles of the night. If your baby's longest stretch tends to come early, going to bed close to your baby's bedtime means the sleep you do get is the richest available. In practice this involves some flexible decision-making, and for the women I support it usually settles into a combination of two things.

The first is putting bub down a little later, closer to your own sleep time, and getting all your evening jobs (dinner, shower, pyjamas) done before they are in bed, so that once they are down you have a genuine hour to yourself rather than a scramble. The second is spending that wind-down well. Nobody feels restored after catching themselves doomscrolling through the one quiet hour of the day, and it tends to push bedtime later or tip into worrying about sleep. Use the time on something that actually feels like rest.

Set a bedtime window that fits. Remember the too-wide window from earlier? The correction is a rule of thumb: before children, most adults spent around eight hours in bed to get about seven hours of sleep. Postnatally, allow a little more to cover the overnight wakes, but resist stretching it to ten or eleven hours chasing lost sleep. You cannot bank it, and a window that wide just spreads your sleep thin across more time in bed, which teaches you to lie there awake.

Work towards a handover. If there is anyone who can take a shift, a partner, a family member, a night here and there from someone you trust, enlist them, and protect your sleep over your guilt. Wanting a patch of uninterrupted sleep is not a failure of commitment to your baby. I know there are real barriers and practical steps to this, and the truth is they tend to ask us to push past our sense of depletion and overwhelm into proactivity. It is a tough push-through, but it can be a rewarding one.

So, if you can, put things in place: get genuinely out of earshot with a separate room or earbuds, and if you are breastfeeding, pump a bottle ahead so someone else can do a feed. Have a conversation with a partner or helper about the specifics. And then repeat the handover until your brain truly believes things are out of your hands for now, so you can actually rest.

How much of this is possible depends on your baby's age, how they are fed, whether they will take a bottle, and so on. Do what you can, and treat the rest as something to work towards.

If you are wide awake anyway, control what you can. Sometimes you will feel completely wide awake, and trying to muscle back into sleep is wasted time. Radical acceptance is a card available to you in your deck, and I think it is a powerful one. Ask yourself: if I had a spare hour in the day, what would I do with it? Then do that. Watch an episode of something, do a facial, read. It sounds like it would keep you up, but facing the waking hour on purpose, rather than lying there in distress, is often what lets the fear of being awake loosen its grip. The only thing off the table is doomscrolling.

Light and movement. The daytime side of sleep matters more than people expect. Getting outside into morning light anchors the body clock, movement builds healthy sleep pressure, and deliberate rest takes some load off a depleted, wrung-out nervous system. None of it needs to be a regime. A short walk with the pram and a coffee in the morning is a brilliant start.

Another small reframe on how you spend the day: use nap times for the things you actually want to do, and save the housework for when the baby is awake. Babies are quite happy to watch you potter. They do not need every waking minute to be enriching, focused play, and you folding washing or making lunch with them nearby is good company as far as they are concerned. It protects a little of the day for you without costing them anything.

Drop the sleep project. If you have accumulated rituals, rules, apps, and calculations around sleep, start subtracting. Get up at roughly the same time each morning, get outside in the light, stop watching the clock overnight, and let sleep come to you on the nights it will. If you are lying awake for long stretches, getting up and doing something low-key in dim light beats lying there rehearsing tomorrow's exhaustion. I would say the same about tracking your baby's sleep. We are biology, not machines, and in most cases the data offer less real insight than our own observations and curiosity. Often the tracking becomes one more thing to monitor, one more source of the very vigilance we are trying to wind down.

Rest or nap. I mentioned rest earlier, and it earns a second mention here, because many women reading this are wired enough that they would not fall asleep in a daytime window even if handed one, and being told to nap just becomes one more thing they are failing at. So take the pressure off and aim for rest, not sleep. Set a timer for thirty minutes, put on something restful (breathwork, a meditation, a quiet audiobook) and make the goal simply to lie down and stop. If sleep comes, good. If it does not, you have still let an overtaxed system downregulate, which is worth having. Sometimes, once the brain stops trying, sleep arrives on its own.

If you are able to drop off to sleep during the day, it helps to know the upside and the downside of a nap. A long afternoon nap is a bit like too much cheese and snacks before dinner: it discharges too much sleep pressure and leaves you unable to fall asleep at night, or to return to sleep in the early hours. So keep any nap short and before mid-afternoon.

Check the physical basics. Low iron is common after birth and can drive restless legs and fragmented sleep, and thyroid changes in the postnatal year can masquerade as pure exhaustion or wired sleeplessness. These are quick blood tests. Raise them with your GP, particularly if your tiredness feels disproportionate or your legs are twitchy at night.

When to reach out

Sleep and mood travel together in the postnatal period, and the traffic runs both ways. Insomnia is one of the stronger warning signs for postnatal depression and anxiety, and treating the insomnia often helps the mood. If your sleeplessness comes with persistent dread, intrusive worries you cannot put down, or a mood that is flat well beyond tiredness, please talk to your GP, or contact PANDA (1300 726 306).

And if your sleep problem has outlived its original cause, meaning the baby now sleeps better than you do, that is precisely the pattern cognitive behavioural therapy for insomnia (CBT-I) was built for. It works in the postnatal period, and it does not require your baby to be a good sleeper first.

The guide

I am putting together a full guide to sleep in the postnatal period: the mechanics in more depth, a step-by-step plan, and some more practical tips. If you would like to stay updated, please let me know by registering your interest.