In this article:
Why Do Newborns Sleep With Their Eyes Half Open?
There is no single confirmed cause, but three factors can explain its occurrence in babies.
1. High proportion of REM sleep
Newborns spend approximately 50% of their sleep time in REM sleep, the active, lighter phase where the brain is busy processing and developing. Adults, by comparison, spend only around 20–25% of their sleep in REM.During REM, the brain sends rapid signals throughout the body. The eyelid muscles are not exempt; they can flutter, twitch, or fail to stay fully closed during this high-activity phase.
2. Immature nervous system
Eyelid closure during sleep is an involuntary function controlled by the nervous system, and in newborns, that system is still maturing. Because they do not yet have full control over their eyelid muscles, partial eye closure during sleep is common. As the nervous system matures over the first year, eyelid control improves, and the behaviour typically fades.3. Genetics
Nocturnal lagophthalmos can run in families. If you, your partner, or a close relative slept with eyes partly open as a baby, your newborn is more likely to do the same.What Does It Look Like?
The most common presentation is partial open-eye sleep, where the eyelids stay slightly separated, and a small portion of the white of the eye or the lower iris is visible. In less common cases, the eyes may appear fully open, making the baby look awake at first glance despite being completely asleep.Other signs you may notice alongside this, all part of normal REM sleep:
- Eyelids twitching or fluttering
- Small facial movements or brief smiles
- Irregular breathing or soft grunting
- Limbs twitching slightly
Nocturnal lagophthalmos does not usually prevent someone from falling asleep or affect the quality of sleep itself. Your baby is resting just as deeply whether their eyes are shut or slightly open.
The only concern is eye dryness: even a small opening in the eyelids can dry out the eyes overnight, and over time, this can lead to irritation or corneal discomfort. In most babies, this is mild and self-limiting.
When Should You See a Doctor?
In most cases, nocturnal lagophthalmos in newborns requires no treatment. However, if your baby's eyes remain open beyond 12 months or show visible signs of irritation, a paediatric ophthalmologist should assess them to rule out any underlying condition.See your paediatrician if your baby shows:
- Persistent redness or watering in the eyes after waking
- Frequent eye rubbing on waking (a sign of dryness or irritation)
- Sensitivity to light
- One eyelid that consistently droops or looks different from the other
What Can You Do at Home?
A few practical steps can help if you notice any dryness or if the sight of open eyes during sleep is unsettling:- Keep the room dim during sleep: Reducing light exposure minimises any stimulation to the partly open eyes and helps the baby stay settled.
- Gently close the eyelids: Once your baby is fully asleep, you can use the soft pads of your fingertips to gently lower their eyelids. This is safe and does not disturb sleep.
- Use a humidifier if needed: If the air is dry, especially common during summers with an air-conditioner, a room humidifier can help keep the eyes from drying out.
- Ask your paediatrician about lubricating drops: If dryness is noticeable, your paediatrician can recommend preservative-free lubricating eye drops specifically formulated for infants.
When Does This Phase Usually Resolve?
Most babies outgrow sleeping with eyes open by around their first birthday as their nervous system matures and sleep cycles become more regulated. Some resolve earlier, around 6 months.A small number of children may continue slightly beyond 18 months; if that happens, a paediatrician can check whether any assessment is needed.
Newborn sleeping with eyes half open is a passing developmental phase, not a sign of a sleep problem or eye condition. Unless your baby shows signs of eye irritation or the behaviour continues well past their first birthday, it will resolve on its own.
Whether you’re pregnant, a new mom, or navigating postpartum, you don’t have to do it alone. Join our support group to connect, share, and support one another.
FAQs on Newborn Sleeping With Eyes Half Open: Is It Normal?
- Will sleeping with eyes half open damage my newborn's vision?
No. Sleeping with eyes open does not cause long-term harm to a child's vision or overall health in physiological cases. The main concern is temporary dryness or mild irritation, not any damage to sight. - Should I wake my baby if their eyes are open during sleep?
No. If your baby is breathing normally, not crying, and their body is relaxed, they are asleep. Waking them to check is unnecessary and disrupts their sleep cycle. The only reason to intervene is if you notice signs of eye dryness or irritation, in which case gently lowering the eyelids with your fingertips is enough.