"Why Is My Baby Waking Up 45 Minutes After Bedtime?"

“I don’t understand what is happening,” Sharon told me about her five-month-old, Ruby.

"I nurse her to sleep and put her down. She used to sleep for hours before waking up for a feed. Now she sometimes only sleeps 45 minutes before she wakes up again, wanting to nurse. I don’t understand why she’s having all these false starts.

I think she’s down for the night, so I start cooking my dinner. Then just as my food is ready, I hear her crying for me again. I already know I’m going to be eating another cold dinner, because I have to go nurse her back to sleep.”

These early wake-ups after bedtime are often called false starts. They are especially common around four to six months old.

What’s happening when your baby wakes 45 minutes after bedtime

Around four to six months, babies begin moving through sleep cycles more like adults do.

Each sleep cycle lasts about 30 to 45 minutes. At the end of that cycle, your baby briefly comes into lighter sleep before continuing into the next one. We adults don't even remember these micro wakings but this is when we typically roll over, fluff the pillow, or adjust the blanket.

But for babies, if they aren’t yet able to connect those cycles smoothly, they may wake fully instead.

That first wake after bedtime is often the earliest place parents notice this change.

Why this wake up happens right after bedtime

In the first few months of life, feeding, rocking, or bouncing a baby to sleep usually works very well.

But around four months of age, babies begin developing more social awareness.

So when they reach the end of that first sleep cycle and their sleep becomes lighter, they suddenly notice something has changed.

The loving arms that helped them fall asleep are gone.

They’re in a different place.

We know it's unlikely to be a hunger issue because they ate recently, and babies this age no longer need to eat frequently like newborns.

The issue is that when self-soothing isn’t present at the start of the night, babies don’t yet know how to return to sleep on their own later.

Why falling asleep in one place and waking in another is hard for babies

Imagine falling asleep in your own cozy bed with your pillow and comforter, and waking up on the living room floor.

You would feel startled.

The same is true for your baby when they fall asleep in one place, your arms, and wake up in another, the crib.

They’re not trying to make bedtime harder. They’re responding to a change they didn’t expect.

You don't have to leave your baby to cry alone

Helping babies learn to fall asleep in the crib doesn’t mean leaving them to cry alone for hours.

It means giving them the opportunity to fall asleep where they will stay asleep.

Your baby can go into the crib or bassinet awake while you stay nearby and support them.

You can comfort them.

You can reassure them.

What changes is that you’re not doing all the work of falling asleep for them.

This helps them recognize their sleep space so that when they reach the end of that first cycle, it's easier to continue sleeping.

When babies usually grow out of false starts

​Most babies begin connecting that first bedtime cycle more consistently between five and seven months if they have learned the skill of self soothing. 

You may notice the wake up becoming shorter first.

Then less frequent.

Then disappearing altogether.

Don't mistake this waking as undertiredness

When babies wake shortly after bedtime, parents sometimes assume bedtime needs to be later.

In fact, overtiredness often makes this wake up more likely.

An earlier bedtime is often helpful.

This is especially true for babies who are also taking short naps during the day.

Many babies who wake 45 minutes after bedtime are also taking short naps during the day. I wrote more about why naps are short around five months here.
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When false starts are a sign your baby needs more support

If your baby wakes after 30 to 45 minutes and then continues waking frequently throughout the evening, this is a sign they’re still learning how to connect sleep cycles consistently.

This is one of the most common transitions families reach out to me about.

There are gentle ways to support longer stretches as your baby’s sleep matures, and most babies make clear progress quickly once the right pieces are in place.

If your little one is struggling to connect sleep cycles, let's talk about what support could look like.