---
title: What Is the Startle Reflex in Infants—And How Does It Impact Sleep?
description: Discover how the startle reflex in infants affects sleep and learn effective strategies to help your baby sleep more soundly despite it.
image: https://info.ancsleep.com/hubfs/Canva%20images/Canva%20Design%20DAGsbm2TFqw.png
---

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# ANCSLEEP BLOG

# What Is the Startle Reflex in Infants—And How Does It Impact Sleep?

Posted by [Darian Dozier](https://info.ancsleep.com/blog/author/darian-dozier) on Aug 21, 2025 8:00:00 AM

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Have you ever watched your peacefully sleeping baby suddenly fling their arms out wide, then pull them back in with a jerk—only to wake themselves up in the process? That’s the **startle reflex**, a completely normal part of infancy that often disrupts sleep, leaving both babies and parents frustrated and exhausted.

But what exactly is the startle reflex, and what can you do about it? Let’s explore the science behind it, why it happens, and how you can help your baby sleep more soundly despite it.

 

****

## What Is the Startle Reflex?

The startle reflex—technically known as the **Moro reflex**—is an automatic, involuntary response that all healthy newborns are born with. It typically appears at birth and fades by around 3 to 6 months of age.

**Here’s what it looks like:**

1. The baby suddenly flings their arms and legs outward.
2. They may arch their back or cry out.
3. Then they quickly bring their limbs back in toward their body.

![Moro reflex Information | Mount Sinai - New York](https://ssl.adam.com/graphics/images/en/17269.jpg)

This reflex is usually triggered by:

- A loud noise
- Sudden movement
- A change in position (like being laid down too quickly)
- Bright lights or other sensory input

---

## How the Startle Reflex Affects Baby Sleep

While the Moro reflex is a sign of a healthy nervous system, it can make sleep *especially* challenging during the newborn months.

#### 1. **It Wakes Babies Mid-Nap or Night**

The reflex can jolt your baby out of deep sleep, even if they were completely calm. These frequent wakings can lead to short naps, restless nights, and fussy days.

#### 2. **It Makes Falling Asleep Harder**

Just as your baby is drifting off, a sudden startle can snap them back to full alertness. This can make it tough for babies to self-settle and extend their sleep stretches.

#### 3. **It Contributes to Overtiredness**

Interrupted sleep leads to overtiredness, which ironically makes babies *harder* to settle and more prone to additional startles. It becomes a frustrating cycle for parents trying to establish good sleep habits.

---

## How to Help Minimize the Startle Reflex During Sleep

You can’t stop the reflex itself—it’s a natural part of development—but you *can* take steps to reduce its impact.

#### ✅ Swaddle Smartly

Swaddling is one of the most effective ways to reduce the impact of the startle reflex. A snug (but safe) swaddle keeps your baby’s arms from flailing outward and startling themselves awake.

- Use a breathable cotton or bamboo swaddle.
- Make sure it’s snug around the arms and loose at the hips.
- Stop swaddling once your baby shows signs of rolling.

#### ✅ Offer a Pacifier

Sucking can be soothing and help regulate your baby’s nervous system. A pacifier may help your baby fall back asleep more easily after a startle.

#### ✅ Keep the Sleep Environment Calm

- Use white noise to reduce the chance of loud sounds causing startles.
- Keep the room dim during night wakings and naps.
- Move your baby gently when laying them down—slow and steady helps prevent position-triggered reflexes.

#### ✅ Try a Transitional Sleep Sack

When your baby outgrows the swaddle, a transitional sleep sack (like a Zipadee-Zip or Merlin’s Magic Sleepsuit) can provide gentle resistance against arm movement while still allowing freedom of movement for safety.

---

## When Will It Go Away?

The good news is that the startle reflex is temporary. It typically begins to fade between **3 and 6 months of age**, as your baby’s nervous system matures and they gain more control over their movements.

Until then, remember: it’s *not* something you’re doing wrong. It’s just a normal part of being a brand-new human.

## Conclusion 

The startle reflex can be frustrating for parents hoping for longer stretches of sleep—but it’s also a reassuring sign of a healthy, developing baby. With the right tools—like swaddling, white noise, and a consistent bedtime routine—you can help minimize disruptions and support your baby’s journey toward more peaceful, restorative sleep.

Hang in there: this phase is short-lived, but your calming presence has a lasting impact.

 

If you or someone you know struggles with sleep, please click the orange button below to take a free online sleep test and talk with one of our sleep health professionals. 

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 Topics: [Baby sleep](https://info.ancsleep.com/blog/topic/baby-sleep)

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- [stroke and sleep (2)](https://info.ancsleep.com/blog/topic/stroke-and-sleep)
- [testosterone and sleep (2)](https://info.ancsleep.com/blog/topic/testosterone-and-sleep)
- [thyroid (2)](https://info.ancsleep.com/blog/topic/thyroid)
- [vitamin deficiency and sleep (2)](https://info.ancsleep.com/blog/topic/vitamin-deficiency-and-sleep)
- [weight loss and sleep (2)](https://info.ancsleep.com/blog/topic/weight-loss-and-sleep)
- [womens sleep (2)](https://info.ancsleep.com/blog/topic/womens-sleep)
- [Academics and sleep (1)](https://info.ancsleep.com/blog/topic/academics-and-sleep)
- [CKD (1)](https://info.ancsleep.com/blog/topic/ckd)
- [Cleaning (1)](https://info.ancsleep.com/blog/topic/cleaning)
- [Cortisol (1)](https://info.ancsleep.com/blog/topic/cortisol)
- [Crohn's Disease (1)](https://info.ancsleep.com/blog/topic/crohns-disease)
- [Dementia and sleep (1)](https://info.ancsleep.com/blog/topic/dementia-and-sleep)
- [Kidney disease (1)](https://info.ancsleep.com/blog/topic/kidney-disease)
- [Neuropathy (1)](https://info.ancsleep.com/blog/topic/neuropathy)
- [New Puppy (1)](https://info.ancsleep.com/blog/topic/new-puppy)
- [Peripheral neuropathy (1)](https://info.ancsleep.com/blog/topic/peripheral-neuropathy)
- [Pulmonology (1)](https://info.ancsleep.com/blog/topic/pulmonology)
- [RLS (1)](https://info.ancsleep.com/blog/topic/rls)
- [Reflux (1)](https://info.ancsleep.com/blog/topic/reflux)
- [SRPE (1)](https://info.ancsleep.com/blog/topic/srpe)
- [Sleep Talking (1)](https://info.ancsleep.com/blog/topic/sleep-talking)
- [Sleep and Eyesight (1)](https://info.ancsleep.com/blog/topic/sleep-and-eyesight)
- [Sleep related painful erections (1)](https://info.ancsleep.com/blog/topic/sleep-related-painful-erections)
- [Ulcerative Colitis (1)](https://info.ancsleep.com/blog/topic/ulcerative-colitis)
- [acid reflux (1)](https://info.ancsleep.com/blog/topic/acid-reflux)
- [addiction and sleep (1)](https://info.ancsleep.com/blog/topic/addiction-and-sleep)
- [adjustable beds (1)](https://info.ancsleep.com/blog/topic/adjustable-beds)
- [ai and sleep (1)](https://info.ancsleep.com/blog/topic/ai-and-sleep)
- [all nighter (1)](https://info.ancsleep.com/blog/topic/all-nighter)
- [altitude (1)](https://info.ancsleep.com/blog/topic/altitude)
- [alzheimers and sleep (1)](https://info.ancsleep.com/blog/topic/alzheimers-and-sleep)
- [anemia and fatigue (1)](https://info.ancsleep.com/blog/topic/anemia-and-fatigue)
- [antioxidants (1)](https://info.ancsleep.com/blog/topic/antioxidants)
- [antipsychotics (1)](https://info.ancsleep.com/blog/topic/antipsychotics)
- [aromatherapy and sleep (1)](https://info.ancsleep.com/blog/topic/aromatherapy-and-sleep)
- [arthritis and sleep (1)](https://info.ancsleep.com/blog/topic/arthritis-and-sleep)
- [artificial intelligence and sleep (1)](https://info.ancsleep.com/blog/topic/artificial-intelligence-and-sleep)
- [autism and sleep (1)](https://info.ancsleep.com/blog/topic/autism-and-sleep)
- [back pain (1)](https://info.ancsleep.com/blog/topic/back-pain)
- [back pain and sleep (1)](https://info.ancsleep.com/blog/topic/back-pain-and-sleep)
- [bipap (1)](https://info.ancsleep.com/blog/topic/bipap)
- [bipolar disorder and sleep (1)](https://info.ancsleep.com/blog/topic/bipolar-disorder-and-sleep)
- [breastfeeding and sleep (1)](https://info.ancsleep.com/blog/topic/breastfeeding-and-sleep)
- [burnout (1)](https://info.ancsleep.com/blog/topic/burnout)
- [caffeine withdrawal (1)](https://info.ancsleep.com/blog/topic/caffeine-withdrawal)
- [cbti (1)](https://info.ancsleep.com/blog/topic/cbti)
- [cerebral palsy and sleep (1)](https://info.ancsleep.com/blog/topic/cerebral-palsy-and-sleep)
- [chronic kidney disease (1)](https://info.ancsleep.com/blog/topic/chronic-kidney-disease)
- [climate and sleep (1)](https://info.ancsleep.com/blog/topic/climate-and-sleep)
- [cluster headache and sleep (1)](https://info.ancsleep.com/blog/topic/cluster-headache-and-sleep)
- [college students (1)](https://info.ancsleep.com/blog/topic/college-students)
- [cosleeping (1)](https://info.ancsleep.com/blog/topic/cosleeping)
- [cpap alternatives (1)](https://info.ancsleep.com/blog/topic/cpap-alternatives)
- [daytime fatigue (1)](https://info.ancsleep.com/blog/topic/daytime-fatigue)
- [decision-making and sleep (1)](https://info.ancsleep.com/blog/topic/decision-making-and-sleep)
- [desert sleep (1)](https://info.ancsleep.com/blog/topic/desert-sleep)
- [dialysis and fatigue (1)](https://info.ancsleep.com/blog/topic/dialysis-and-fatigue)
- [digestion and sleep (1)](https://info.ancsleep.com/blog/topic/digestion-and-sleep)
- [doomscrolling and sleep (1)](https://info.ancsleep.com/blog/topic/doomscrolling-and-sleep)
- [drowsy teen driving (1)](https://info.ancsleep.com/blog/topic/drowsy-teen-driving)
- [dry climate and sleep (1)](https://info.ancsleep.com/blog/topic/dry-climate-and-sleep)
- [eczema and sleep (1)](https://info.ancsleep.com/blog/topic/eczema-and-sleep)
- [epworth sleep scale (1)](https://info.ancsleep.com/blog/topic/epworth-sleep-scale)
- [essential oils (1)](https://info.ancsleep.com/blog/topic/essential-oils)
- [estrogen and sleep (1)](https://info.ancsleep.com/blog/topic/estrogen-and-sleep)
- [excessive daytime sleepiness (1)](https://info.ancsleep.com/blog/topic/excessive-daytime-sleepiness)
- [face shape and sleep (1)](https://info.ancsleep.com/blog/topic/face-shape-and-sleep)
- [family sleep health (1)](https://info.ancsleep.com/blog/topic/family-sleep-health)
- [fasting and sleep (1)](https://info.ancsleep.com/blog/topic/fasting-and-sleep)
- [fibroids and sleep (1)](https://info.ancsleep.com/blog/topic/fibroids-and-sleep)
- [fibromyalgia (1)](https://info.ancsleep.com/blog/topic/fibromyalgia)
- [fibromyalgia and sleep (1)](https://info.ancsleep.com/blog/topic/fibromyalgia-and-sleep)
- [focus (1)](https://info.ancsleep.com/blog/topic/focus)
- [focus and sleep (1)](https://info.ancsleep.com/blog/topic/focus-and-sleep)
- [glp1 and sleep (1)](https://info.ancsleep.com/blog/topic/glp1-and-sleep)
- [gout (1)](https://info.ancsleep.com/blog/topic/gout)
- [grief (1)](https://info.ancsleep.com/blog/topic/grief)
- [grief and sleep (1)](https://info.ancsleep.com/blog/topic/grief-and-sleep)
- [gut health and sleep (1)](https://info.ancsleep.com/blog/topic/gut-health-and-sleep)
- [heart failure (1)](https://info.ancsleep.com/blog/topic/heart-failure)
- [heart health and sleep (1)](https://info.ancsleep.com/blog/topic/heart-health-and-sleep)
- [herbal remedies for sleep (1)](https://info.ancsleep.com/blog/topic/herbal-remedies-for-sleep)
- [high blood pressure and sleep (1)](https://info.ancsleep.com/blog/topic/high-blood-pressure-and-sleep)
- [hot flashes and sleep (1)](https://info.ancsleep.com/blog/topic/hot-flashes-and-sleep)
- [hypervigilence and sleep (1)](https://info.ancsleep.com/blog/topic/hypervigilence-and-sleep)
- [hypoglycemia (1)](https://info.ancsleep.com/blog/topic/hypoglycemia)
- [inflammation (1)](https://info.ancsleep.com/blog/topic/inflammation)
- [irritable bowel syndrome (1)](https://info.ancsleep.com/blog/topic/irritable-bowel-syndrome)
- [late night (1)](https://info.ancsleep.com/blog/topic/late-night)
- [learning and sleep (1)](https://info.ancsleep.com/blog/topic/learning-and-sleep)
- [learning disabilities (1)](https://info.ancsleep.com/blog/topic/learning-disabilities)
- [leg swelling (1)](https://info.ancsleep.com/blog/topic/leg-swelling)
- [light therapy (1)](https://info.ancsleep.com/blog/topic/light-therapy)
- [liver disease (1)](https://info.ancsleep.com/blog/topic/liver-disease)
- [metabolic syndrome and sleep (1)](https://info.ancsleep.com/blog/topic/metabolic-syndrome-and-sleep)
- [microsleep (1)](https://info.ancsleep.com/blog/topic/microsleep)
- [middle age (1)](https://info.ancsleep.com/blog/topic/middle-age)
- [midnight awakenings (1)](https://info.ancsleep.com/blog/topic/midnight-awakenings)
- [migraine (1)](https://info.ancsleep.com/blog/topic/migraine)
- [morning fatigue (1)](https://info.ancsleep.com/blog/topic/morning-fatigue)
- [mouthguards and sleep (1)](https://info.ancsleep.com/blog/topic/mouthguards-and-sleep)
- [multiple sclerosis (1)](https://info.ancsleep.com/blog/topic/multiple-sclerosis)
- [muscle tension and sleep (1)](https://info.ancsleep.com/blog/topic/muscle-tension-and-sleep)
- [new mother sleep (1)](https://info.ancsleep.com/blog/topic/new-mother-sleep)
- [nicotine (1)](https://info.ancsleep.com/blog/topic/nicotine)
- [night owl (1)](https://info.ancsleep.com/blog/topic/night-owl)
- [night time cramps (1)](https://info.ancsleep.com/blog/topic/night-time-cramps)
- [nighttime affirmations (1)](https://info.ancsleep.com/blog/topic/nighttime-affirmations)
- [nighttime awakenings (1)](https://info.ancsleep.com/blog/topic/nighttime-awakenings)
- [nighttime hives (1)](https://info.ancsleep.com/blog/topic/nighttime-hives)
- [nighttime itching (1)](https://info.ancsleep.com/blog/topic/nighttime-itching)
- [nighttime rumination (1)](https://info.ancsleep.com/blog/topic/nighttime-rumination)
- [nighttime worry (1)](https://info.ancsleep.com/blog/topic/nighttime-worry)
- [ocd and sleep (1)](https://info.ancsleep.com/blog/topic/ocd-and-sleep)
- [outdoor sleep (1)](https://info.ancsleep.com/blog/topic/outdoor-sleep)
- [oxytocin and sleep (1)](https://info.ancsleep.com/blog/topic/oxytocin-and-sleep)
- [parent (1)](https://info.ancsleep.com/blog/topic/parent)
- [parenting (1)](https://info.ancsleep.com/blog/topic/parenting)
- [peripheral vascular disease and sleep (1)](https://info.ancsleep.com/blog/topic/peripheral-vascular-disease-and-sleep)
- [phones and sleep (1)](https://info.ancsleep.com/blog/topic/phones-and-sleep)
- [physical activity (1)](https://info.ancsleep.com/blog/topic/physical-activity)
- [pilates and sleep (1)](https://info.ancsleep.com/blog/topic/pilates-and-sleep)
- [plmd (1)](https://info.ancsleep.com/blog/topic/plmd)
- [poor sleep (1)](https://info.ancsleep.com/blog/topic/poor-sleep)
- [posture and sleep (1)](https://info.ancsleep.com/blog/topic/posture-and-sleep)
- [progesterone and sleep (1)](https://info.ancsleep.com/blog/topic/progesterone-and-sleep)
- [protein and sleep (1)](https://info.ancsleep.com/blog/topic/protein-and-sleep)
- [psych (1)](https://info.ancsleep.com/blog/topic/psych)
- [reading and sleep (1)](https://info.ancsleep.com/blog/topic/reading-and-sleep)
- [recovery and sleep (1)](https://info.ancsleep.com/blog/topic/recovery-and-sleep)
- [remote workers (1)](https://info.ancsleep.com/blog/topic/remote-workers)
- [reproductivity and sleep (1)](https://info.ancsleep.com/blog/topic/reproductivity-and-sleep)
- [retirement and sleep (1)](https://info.ancsleep.com/blog/topic/retirement-and-sleep)
- [revenge bedtime procrastination (1)](https://info.ancsleep.com/blog/topic/revenge-bedtime-procrastination)
- [school and sleep (1)](https://info.ancsleep.com/blog/topic/school-and-sleep)
- [sciatica and sleep (1)](https://info.ancsleep.com/blog/topic/sciatica-and-sleep)
- [sedentary lifestyle and sleep (1)](https://info.ancsleep.com/blog/topic/sedentary-lifestyle-and-sleep)
- [sids (1)](https://info.ancsleep.com/blog/topic/sids)
- [sjrogrens and sleep (1)](https://info.ancsleep.com/blog/topic/sjrogrens-and-sleep)
- [sleep and appetite (1)](https://info.ancsleep.com/blog/topic/sleep-and-appetite)
- [sleep and empathy (1)](https://info.ancsleep.com/blog/topic/sleep-and-empathy)
- [sleep and executive functioning (1)](https://info.ancsleep.com/blog/topic/sleep-and-executive-functioning)
- [sleep and mood (1)](https://info.ancsleep.com/blog/topic/sleep-and-mood)
- [sleep and outlook (1)](https://info.ancsleep.com/blog/topic/sleep-and-outlook)
- [sleep and self-perception (1)](https://info.ancsleep.com/blog/topic/sleep-and-self-perception)
- [sleep and stroke (1)](https://info.ancsleep.com/blog/topic/sleep-and-stroke)
- [sleep and temperature (1)](https://info.ancsleep.com/blog/topic/sleep-and-temperature)
- [sleep and trauma (1)](https://info.ancsleep.com/blog/topic/sleep-and-trauma)
- [sleep and work (1)](https://info.ancsleep.com/blog/topic/sleep-and-work)
- [sleep doctors (1)](https://info.ancsleep.com/blog/topic/sleep-doctors)
- [sleep drive (1)](https://info.ancsleep.com/blog/topic/sleep-drive)
- [sleep inertia (1)](https://info.ancsleep.com/blog/topic/sleep-inertia)
- [sleep influencers (1)](https://info.ancsleep.com/blog/topic/sleep-influencers)
- [sleep score (1)](https://info.ancsleep.com/blog/topic/sleep-score)
- [sleepwear (1)](https://info.ancsleep.com/blog/topic/sleepwear)
- [snacks (1)](https://info.ancsleep.com/blog/topic/snacks)
- [snooze (1)](https://info.ancsleep.com/blog/topic/snooze)
- [social media and sleep (1)](https://info.ancsleep.com/blog/topic/social-media-and-sleep)
- [somniphobia (1)](https://info.ancsleep.com/blog/topic/somniphobia)
- [stimulants and sleep (1)](https://info.ancsleep.com/blog/topic/stimulants-and-sleep)
- [substance abuse and sleep (1)](https://info.ancsleep.com/blog/topic/substance-abuse-and-sleep)
- [supplements (1)](https://info.ancsleep.com/blog/topic/supplements)
- [teeth grinding at night (1)](https://info.ancsleep.com/blog/topic/teeth-grinding-at-night)
- [tension headache and sleep (1)](https://info.ancsleep.com/blog/topic/tension-headache-and-sleep)
- [tmj and sleep (1)](https://info.ancsleep.com/blog/topic/tmj-and-sleep)
- [untreated sleep apnea (1)](https://info.ancsleep.com/blog/topic/untreated-sleep-apnea)
- [vaping and sleep (1)](https://info.ancsleep.com/blog/topic/vaping-and-sleep)
- [weight gain and sleep (1)](https://info.ancsleep.com/blog/topic/weight-gain-and-sleep)
- [weighted blanket and sleep (1)](https://info.ancsleep.com/blog/topic/weighted-blanket-and-sleep)
- [wfh (1)](https://info.ancsleep.com/blog/topic/wfh)
- [worry window (1)](https://info.ancsleep.com/blog/topic/worry-window)
- [yawn (1)](https://info.ancsleep.com/blog/topic/yawn)
- [yawning (1)](https://info.ancsleep.com/blog/topic/yawning)

[see all](https://info.ancsleep.com/blog/what-is-the-startle-reflex-in-infants-and-how-does-it-impact-sleep#)

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