Baby Laughs in Their Sleep
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published NSF, NIH, AAP guidelines
Last reviewed:
Sleep concerns affect nearly every family at some point. When it comes to baby laughs in their sleep, here is what the guidelines recommend.
The short answer
Sleep laughing (hypnogely) is a normal phenomenon in babies and children. It occurs during REM (active) sleep and is thought to be related to normal brain development and processing. It is charming and completely harmless. Enjoy it.
Key takeaways
- Sleep laughing (hypnogely) is a normal phenomenon in babies and children. It occurs during REM (active) sleep and is thought to be related to normal brain development and processing. It is charming and completely harmless. Enjoy it.
- Usually normal when: Brief episodes of laughing or giggling during sleep
- Call your doctor if: Laughing episodes are accompanied by seizure-like movements such as stiffening, jerking, or eye rolling
- Varies by age — see the age-by-age breakdown below
“To reduce the risk of sleep-related infant deaths, the AAP recommends that infants sleep on their backs, on a firm, flat surface, without any soft bedding.”
Parents everywhere have the same worry. You are doing the right thing by looking into it.
What Parents Should Know
According to NSF, NIH, AAP guidelines, sleep laughing (hypnogely) is a normal phenomenon in babies and children. It occurs during REM (active) sleep and is thought to be related to normal brain development and processing. It is charming and completely harmless. Enjoy it. At 0-3 months, newborns often smile and sometimes laugh during sleep. These are reflexive expressions during REM sleep rather than responses to dreams. They reflect normal neurological activity and are a sign of healthy brain development. It is generally considered normal when brief episodes of laughing or giggling during sleep. However, you should contact your pediatrician promptly if laughing episodes are accompanied by seizure-like movements such as stiffening, jerking, or eye rolling.
Normal vs. Concerning
By Age
What to expect by age
0-3 months
Newborns often smile and sometimes laugh during sleep. These are reflexive expressions during REM sleep rather than responses to dreams. They reflect normal neurological activity and are a sign of healthy brain development.
3-12 months
As your baby develops social smiling and laughter during the day, you may hear more laughter during sleep as their brain processes daytime experiences. This is a normal and delightful part of development.
12-24 months
Toddlers may laugh, talk, or mumble during sleep as their dream life becomes more complex. These episodes are brief and harmless.
2-5 years
Sleep laughing remains common and normal. If your child has happy dreams they can sometimes describe them in the morning, which can be wonderful to hear about.
What to Tell Your Pediatrician
- Describe when you first noticed baby laughs in their sleep and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if laughing episodes are very frequent, prolonged, or seem forced or mechanical.
- Mention if episodes are accompanied by unusual movements or stiffening.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Brief episodes of laughing or giggling during sleep
- Baby is otherwise sleeping well and seems fine
- Laughing occurs during active REM phases of sleep
- Episodes are brief and baby continues sleeping
- Laughing episodes are very frequent, prolonged, or seem forced or mechanical
- Episodes are accompanied by unusual movements or stiffening
- Laughing during sleep is a new behavior in a child who previously did not do this along with other concerning behavioral changes
- Laughing episodes are accompanied by seizure-like movements such as stiffening, jerking, or eye rolling
- Your child seems confused, distressed, or unresponsive after episodes
What You Can Do at Home
- Keep track of when you notice baby laughs in their sleep — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that brief episodes of laughing or giggling during sleep — this is generally within the range of normal.
- At 0-3 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Maintain a consistent bedtime routine. Keep the sleep environment cool, dark, and quiet.
- While monitoring at home, seek immediate care if laughing episodes are accompanied by seizure-like movements such as stiffening, jerking, or eye rolling.
Related Conditions
Baby Cries with Eyes Closed During Sleep
Crying or whimpering with eyes closed during sleep is very common and is part of normal active (REM) sleep. Babies spend much more time in active sleep than adults, and they may cry, moan, grunt, or make facial expressions without being awake. Wait a few minutes before responding - many babies settle back into quiet sleep on their own.
My Baby Moans in Their Sleep
Moaning, groaning, and grunting during sleep are extremely common in babies and are almost always harmless. Babies spend a large proportion of their sleep in active (REM) sleep, during which they naturally vocalize, twitch, and make facial expressions. These sounds typically decrease as your baby's nervous system matures over the first few months.
Related Resources
Baby Sleep Guide
Age-by-age sleep needs, schedules, and evidence-based sleep strategies.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is baby laughs in their sleep normal?
When should I call the doctor about baby laughs in their sleep?
When is baby laughs in their sleep normal?
What causes baby laughs in their sleep?
What should I mention to my pediatrician about baby laughs in their sleep?
Is baby laughs in their sleep normal at 0-3 months?
Is baby laughs in their sleep normal at 3-12 months?
Should I go to the ER for baby laughs in their sleep?
Does baby laughs in their sleep go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Baby Laughs in Their Sleep.
Things to mention
- Describe when you first noticed baby laughs in their sleep and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if laughing episodes are very frequent, prolonged, or seem forced or mechanical.
- Mention if episodes are accompanied by unusual movements or stiffening.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Laughing episodes are very frequent, prolonged, or seem forced or mechanical
- Episodes are accompanied by unusual movements or stiffening
- Laughing during sleep is a new behavior in a child who previously did not do this along with other concerning behavioral changes
Urgent signs to report immediately
- Laughing episodes are accompanied by seizure-like movements such as stiffening, jerking, or eye rolling
- Your child seems confused, distressed, or unresponsive after episodes
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of baby laughs in their sleep are normal. Talk to your pediatrician if laughing episodes are accompanied by seizure-like movements such as stiffening, jerking, or eye rolling.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Sleep Concerns
Baby Cries with Eyes Closed During Sleep
Crying or whimpering with eyes closed during sleep is very common and is part of normal active (REM) sleep. Babies spend much more time in active sleep than adults, and they may cry, moan, grunt, or make facial expressions without being awake. Wait a few minutes before responding - many babies settle back into quiet sleep on their own.
My Baby Moans in Their Sleep
Moaning, groaning, and grunting during sleep are extremely common in babies and are almost always harmless. Babies spend a large proportion of their sleep in active (REM) sleep, during which they naturally vocalize, twitch, and make facial expressions. These sounds typically decrease as your baby's nervous system matures over the first few months.
How Long Should Baby Be Awake Between Naps?
The ideal awake time between naps (called a "wake window") increases as your baby grows. Newborns may only handle 45-90 minutes awake, while toddlers can manage 4-6 hours. Getting wake windows right is one of the most effective ways to improve nap quality, because both too-short and too-long wake times lead to poor sleep.
Is a Bath Before Bed Really Necessary?
A nightly bath is not medically necessary and some babies with sensitive skin do better with less frequent bathing. However, a warm bath can be a powerful sleep cue because the subsequent body temperature drop triggers melatonin production. If you include a bath, keep it calm and warm rather than stimulating.
How Long Should the Bedtime Routine Be?
An ideal bedtime routine for babies and toddlers is 20-30 minutes. Shorter routines may not give enough time to wind down, while routines longer than 45 minutes can become a stalling tactic. Consistency in the routine order matters more than exact length.
Is My Baby's Bedtime Too Early?
For most babies over 3 months, bedtime between 6:00-8:00 PM is appropriate. A bedtime that is too early can cause early morning wakings (before 6 AM) or long periods of wakefulness in the middle of the night. However, during nap transitions or on days when naps were short, an earlier-than-usual bedtime helps prevent overtiredness.