The 8-month sleep regression: what's going on and how to cope

Your baby was finally sleeping well — and then, somewhere around eight months, the nights fell apart again. More wake-ups, shorter naps, a baby who stands up in the crib at 2am or sobs the moment you leave the room. It can feel like everything you built has come undone. It hasn’t. This is the 8-month sleep regression (it can land anywhere from about eight to ten months), and like the 4-month regression, it’s driven by growth, not by anything going wrong.

Why it happens

At this age your baby is doing an enormous amount of learning, and a busy brain doesn’t switch off neatly at bedtime.

• New physical skills. Crawling, pulling to stand and cruising along the furniture are thrilling — and babies love to practice, often at night. It’s common to find your baby wide awake, up on their hands and knees or standing in the crib, rehearsing.
• Separation anxiety. Around now your baby grasps that you still exist when you’re out of sight — which is exactly why they want you to stay. This isn’t a habit or a step backwards; it’s a genuine developmental leap, and it can make bedtimes and night-wakings feel much more intense.
• A shifting nap schedule. Many babies are ready to move from three naps to two around this age. A nap that’s outgrown but still clung to can push bedtime late and leave your baby overtired and wired.
• Language and cognition. Understanding words, tracking where things (and people) go, babbling with intent — this quiet mental leap can stir up sleep too.

Because all of this is development, “regression” is a bit of a misnomer. Nothing is broken; your baby is busy.

How long it lasts

Usually two to six weeks. It eases as the new skills become old news and the nap schedule steadies. The families who get through it fastest tend to be the ones who keep the daytime rhythm and bedtime steady rather than reinventing everything.

What actually helps

None of this is a magic switch, but these calm, consistent moves make the biggest difference:

• Keep the routine that already worked. The temptation to bring your baby into your bed, rock them fully to sleep or skip the bath is strong when you’re exhausted. But a familiar, predictable bedtime routine is the anchor in this phase — the same few calm steps in the same order signal that sleep is coming.
• Practice the new skills in the daytime. The more your baby crawls, pulls up and (crucially) practices sitting or lying back down while awake, the less they’ll need to rehearse at 2am. Lots of floor time helps.
• Mind the wake windows. As naps shift, going by the clock stops working. Watch for tired cues and adjust; an overtired baby resists sleep harder. See our wake windows by age guide, and shift bedtime a little earlier on short-nap days.
• Reassure without building a new crutch. When separation anxiety spikes, go to your baby, but keep it calm and low-key — a steady voice, a gentle hand, less than a full wake-up production. You’re teaching them that you always come back, not that every stir needs rescuing.
• A calm, unstimulating wind-down. Dim the lights, slow everything down, and give an excited brain time to downshift before sleep.

Be kind to yourself

This one is hard precisely because it often follows a good stretch — and because a baby standing and crying in the crib pulls hard at you. Tag-team the nights if you can, lower the bar on everything else, and hold on to the fact that it’s temporary.

Take the guesswork out of the timing

The trickiest part is catching the right nap and bedtime windows while everything is shifting from three naps to two. That’s what Nana is for — it learns your baby’s changing rhythm and tells you when the next sleep is due, so you’re not doing the math on no sleep yourself.

Every baby is different, and this isn’t medical advice. If your baby seems unwell, isn’t feeding, or something worries you, contact your pediatrician.