Baby Laughs in Their Sleep
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.
Parents everywhere have the same worry. You are doing the right thing by looking into it.
By Age
What to expect by age
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.
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.
Toddlers may laugh, talk, or mumble during sleep as their dream life becomes more complex. These episodes are brief and harmless.
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 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
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
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.