Short naps are one of the most common frustrations in the first year. Here's why they happen, when they ease, and what you can do to gently encourage longer stretches.
If your baby naps for exactly 30 to 40 minutes and then wakes up as if they've had a full night's sleep (spoiler: they haven't), you are in very good company. Short naps are probably the number one nap complaint I hear from parents, and they can feel incredibly demoralising, especially when you've spent 20 minutes settling your baby only to have them wake before you've finished making a cup of tea.
I want to start by saying that short naps are developmentally normal for many babies, particularly under 5 to 6 months. That doesn't make them any less frustrating, but it can help to know that in many cases, you're not doing anything wrong. Your baby's nap length is a reflection of their brain's maturity, not your parenting.
Why short naps happen
The most common reason is that your baby is waking at the end of their first sleep cycle (around 30 to 45 minutes) and doesn't yet have the ability to transition into the next one without help. This is the same reason babies wake between cycles at night, but during the day, the drive to sleep is weaker, which makes it harder for them to settle back in.
Overtiredness is a frequent contributor. A baby who is awake too long before a nap often falls asleep quickly but wakes after one cycle because the quality of sleep is poorer. Getting the timing right, catching the window before overtiredness kicks in, can sometimes be the only change needed to extend a nap.
Undertiredness is the opposite issue. If your baby hasn't been awake long enough to build up sufficient sleep pressure, they may fall asleep but have a very light, short nap because their body simply didn't need more. As your baby grows, wake windows lengthen, and the timings that worked a month ago may no longer apply.
The sleep environment matters too. Light, noise, and temperature can all affect nap length. A dark, quiet room with a consistent temperature gives your baby's body the best chance of staying in sleep once they're there.
What you can do
First, check the timing. Make sure your baby has been awake long enough to need the nap, but not so long that they're overtired. This can be a narrow window, and it changes as your baby grows, so it's worth paying close attention to their tired cues rather than relying solely on the clock.
If your baby wakes after one cycle, try resettling them before assuming the nap is over. Sometimes a gentle hand on the chest, some shushing, or a brief feed can help them slip back into the next cycle. If it doesn't work, that's okay. Just try again next nap.
You can also try one contact nap and one crib nap per day. Many parents find that their baby sleeps longer in arms, and that's because your body helps bridge the sleep cycle transition. Using contact naps strategically while working on extending crib naps can be a good middle ground.
The Nap So Simple guide covers everything from short naps and nap resistance, to extending naps, optimising wake windows, transitioning between nap schedules, and finding the balance between contact and crib naps. It's practical, gentle, and designed to help you find what works for your baby without any rigid rules or sleep training. It's been used by thousands of families to bring more ease and predictability to daytime sleep.
Short naps won't last forever. Your baby's ability to nap for longer stretches is developing right now, even if it doesn't feel like it. And in the meantime, you're doing a wonderful job.
