It is understandably distressing to hear your baby cry in the middle of the night, but it is often a normal part of infant sleep. Babies cry in their sleep for several distinct reasons, including active sleep cycles, developmental milestones, and simple discomfort. In most cases, a crying baby is still asleep and does not need to be woken up, but understanding the cause helps you respond safely.
Why Do Babies Cry In Their Sleep During Active Sleep?
Babies spend much more time in active sleep than adults do. Active sleep is the infant version of REM sleep, the stage where dreaming occurs. During this stage, a baby’s brain is highly active, and their body is not fully paralyzed like an older child’s would be.
This means you might see your baby twitching, smiling, making sucking motions, or even crying out. These are called sleep starts or sleep myoclonus. The crying is often just a vocalization that happens during a dream or a brain signal, not a sign of distress.
Newborns spend about 50 percent of their sleep time in this active phase. As they grow, this percentage decreases. If your baby cries out but shows no signs of waking, like fluttering eyelids or increased movement, they are likely in active sleep. The best response is often to wait a moment before intervening. Picking them up may wake them fully, which disrupts their natural sleep cycle.
Is It A Nightmare Or A Night Terror?
For older babies and toddlers, crying in sleep can be linked to night terrors. Night terrors are different from nightmares. A nightmare happens during REM sleep and a child may wake up crying and be comforted by a parent. Night terrors happen during deep non-REM sleep, usually in the first few hours after falling asleep.
During a night terror, a child may sit up, cry, scream, or thrash around, but they are not actually awake. Their eyes may be open, but they are unresponsive to your voice. They may not recognize you and may push you away. This is a frightening experience for parents, but the child rarely remembers it in the morning.
Night terrors are not harmful. The child is not in pain or distress. The safest approach is to stay nearby and ensure they cannot hurt themselves. Do not try to wake them. Waking a child from a night terror often makes them more confused and agitated. The episode usually passes within a few minutes. If night terrors happen frequently or interfere with sleep, a pediatrician can offer guidance.
When Is Crying In Sleep A Sign Of Discomfort?
Sometimes the crying is not a sleep phase but a signal of a physical need. Babies cannot tell you they are too hot, too cold, or in pain. They cry. If the crying is persistent rather than brief, check for common causes of discomfort.
If you have addressed these needs and the baby settles back to sleep, the issue is resolved. If the crying continues despite comfort and feeding, contact your pediatrician.
Do Sleep Regressions Cause Night Crying?
Sleep regressions are periods when a baby who previously slept well suddenly wakes more often. They often happen around 4 months, 6 months, 8 to 10 months, and 12 months. These are not actually regressions in development. They are periods of rapid brain growth and new skill acquisition.
When a baby learns to roll, crawl, or pull up, their brain is busy practicing these skills. This can happen during sleep. A baby may cry out because they rolled onto their stomach and do not know how to roll back. Or they may cry because they are trying to practice a new skill in their sleep.
These phases are temporary. They usually last from a few days to a few weeks. During this time, the baby’s sleep architecture is changing. At around 4 months, a baby’s sleep cycles begin to resemble adult patterns. They start to have lighter sleep phases between deep sleep cycles. This makes them more likely to wake fully between cycles and cry for help to fall back asleep.
This is a normal developmental stage. It does not require any specific treatment other than consistency and patience. If you respond quickly, you may inadvertently teach the baby that crying brings attention, which can prolong the phase. If you let them fuss for a few minutes, they may learn to self-settle. There is no single right answer, and different families choose different approaches.
Should You Let A Baby Cry It Out?
The decision to let a baby cry is deeply personal. There are several methods, ranging from extinction (leaving the baby to cry until they fall asleep) to graduated methods like the Ferber method, where you check on the baby at increasing intervals.
Research on sleep training shows that behavioral interventions can improve infant sleep. Studies have found that most healthy babies over 6 months can learn to self-soothe without long-term harm. However, the evidence on long-term psychological effects is limited. No large, long-term studies have shown that crying it out causes emotional damage, but the research is not extensive.
The American Academy of Pediatrics notes that there is no evidence that sleep training methods cause harm. However, they also emphasize that every family is different. What works for one baby may not work for another. Some babies respond well to a gentle check-in method. Others become more upset when a parent enters the room and leaves again.
If you choose to sleep train, wait until your baby is developmentally ready. Most experts suggest waiting until at least 4 to 6 months of age. Before that age, babies need frequent night feeds and cannot yet self-regulate their sleep cycles. Always check with your pediatrician before starting any sleep training method, especially if your baby has health issues or is underweight.
How To Tell If Your Baby Is Actually Awake
Before you rush to the crib, learn to read your baby’s cues. A baby who is crying in their sleep may have their eyes closed. Their breathing may be irregular. They may be moving their arms and legs. But their eyes are not open, and they are not looking around.
A baby who is truly awake will have open eyes. They may be looking toward the door or searching for you. They may make eye contact. Their cry may sound more demanding or urgent. This distinction matters because responding to a sleeping baby can wake them. Responding to an awake baby meets their need.
One strategy is to pause for two to five minutes before responding. This gives the baby a chance to settle back to sleep on their own. Many babies cry for a minute or two during a sleep cycle transition and then drift back off. If the crying escalates, go to them. If it fades, let them be.
When Should You Call The Doctor?
Most crying in sleep is normal. But some situations warrant a call to your pediatrician. Trust your instincts. If something feels wrong, it is always appropriate to seek advice.
Contact your doctor if your baby has a fever, is breathing rapidly, is listless during waking hours, or is not feeding well. Crying that lasts for more than three hours a day, multiple days a week, could indicate colic or another issue. A sudden change in crying pattern, especially if the cry sounds like a scream or is accompanied by arching of the back, could indicate reflux or another medical problem.
Also contact your doctor if your baby is not gaining weight or if you are struggling to cope with the sleep disruption. Postpartum depression and anxiety are common. Your mental health matters for your baby’s well-being. Do not hesitate to ask for help.
Frequently Asked Questions
Why does my baby cry with eyes closed?
This usually means they are in active sleep or transitioning between sleep cycles. It is normal and they are likely not awake.
Should I pick up my baby when they cry in their sleep?
Wait a few minutes to see if they settle on their own first. If the crying escalates or they wake up, then pick them up to comfort them.
Can teething cause a baby to cry in their sleep?
Yes, teething pain can cause night waking and crying, especially in babies over 4 months old. The discomfort is often temporary and can be managed with pediatrician-approved remedies.
How long do sleep regressions last?
Most sleep regressions last between two and six weeks. They are temporary phases linked to developmental milestones and brain growth.
