As a new parent, hearing your newborn crying in sleep can be heart-wrenching and confusing. You finally get them to drift off, only to hear whimpers or full-blown cries a few minutes later. But here’s the secret: most of the time, your baby is actually still asleep!
In this guide, we’ll explore why crying in sleep newborn behavior happens and how you can ensure your little one (and you) gets a peaceful night’s rest.
The Science: Why Do Newborns Cry While Sleeping?
The most common reason for a newborn crying in sleep is their unique sleep cycle. Unlike adults, who spend most of the night in deep, quiet sleep, newborns spend about 50% of their sleep in the REM (Rapid Eye Movement) phase, also known as “Active Sleep.”
During active sleep, a baby’s brain is busy developing. You might notice:
Their eyes fluttering under their lids.
Jerky movements in their arms or legs.
Soft whimpering, grunting, or occasional crying.
In most cases, this is just a developmental milestone and nothing to worry about.
Top 4 Reasons for Newborn Crying in Sleep
Beyond active sleep, there are a few physical reasons why your baby might be fussy during the night:
1. Hunger Cues
Even in sleep, a baby’s stomach is tiny. They might start “dream-crying” because they are beginning to feel hungry. If they don’t settle down within a minute, it might be time for a feed.
2. Overtiredness or Overstimulation
If your baby had a very busy day with lots of guests or missed their daytime naps, their nervous system might be overstimulated, leading to more restless “active sleep” sessions.
3. Physical Discomfort (Gas or Reflux)
If you notice your newborn arching back and crying, it’s a classic sign of silent reflux or trapped gas.
Internal Link: Also, check out our guide on newborn arching back and cryingto understand how to handle infant reflux.
4. Room Temperature
A baby who is too hot or too cold will never sleep soundly.
Internal Link: Make sure your nursery is set to the ideal room temperature for newborn safety (usually 20°C to 22°C).
What to Do When Your Baby Starts Crying in Their Sleep?
Before you rush in and pick them up, follow the “Wait and Watch” rule:
- Pause for 60 Seconds: Often, a baby will cry for a few seconds and then settle back into a deeper sleep. If you pick them up immediately, you might actually wake them up fully!
- Gentle Shush or Pat: If the crying continues, try a soft “shhh” sound or a gentle pat on the chest without picking them up.
- Check the Diaper: Do a quick “sniff test” or a stealthy feel. If it’s wet, a quick, quiet change is needed.
When to Be Concerned?
While newborn crying in sleep is usually normal, you should contact your pediatrician if:
- The crying sounds like a scream of intense pain.
- Your baby has a fever or is showing signs of illness.
- You are worried about their development (e.g., you’re looking for early signs of autism).
For more clinical information on newborn health screenings, you can also read about the Vital Newborn PKU Test.
Summary for Parents
A crying in sleep newborn is rarely a cause for alarm. It’s usually just a sign of a healthy, developing brain navigating the “Active Sleep” phase. Keep the room comfortable, use white noise, and always give them a minute to self-soothe before intervening.