Colin Snow
The arrival of a newborn baby brings a lot of questions, and one of the most common queries relates to their sleeping environment. Should newborns sleep in the light or in the dark? The short answer is that darkness is best for newborn sleep. This is because light, especially blue light, can disrupt the production of melatonin, the sleep hormone, and confuse their developing circadian rhythm, making it harder for them to fall and stay asleep. Darkness, on the other hand, promotes restorative sleep, which is essential for a newborn's growth and development.
However, there are some nuances to this. During the day, it is beneficial to let newborns nap in a light room to help establish their circadian rhythm and avoid confusion between night and day. Additionally, night lights can be useful for parents during nighttime feedings or diaper changes, but it is important to keep the light dim and red or orange in colour to minimise disruption to the baby's sleep.
| Characteristics | Values |
|---|---|
| Light exposure | Newborns should be exposed to light during the day to help establish their circadian rhythm. |
| Sleep quality | Darkness is essential for restorative sleep as it promotes the production of melatonin, the sleep hormone. |
| Circadian rhythm | Light provides cues to newborns about when to be awake and when to sleep, supporting the development of their circadian rhythm. |
| Vision | Newborns have poor vision and are sensitive to light, especially UV and blue light during the first two months. |
| Night lights | Night lights can be useful for parents during nighttime feedings and diaper changes but should be dim and red/amber in colour to minimise disruption to sleep. |
| Age | Newborns can sleep in a dark room from birth, but some recommend waiting until they are several weeks old as complete darkness may be frightening due to their underdeveloped eyesight. |
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What You'll Learn
Newborns' eyes are sensitive to light, and they need time to adjust
Newborns' eyes are incredibly sensitive, and they need time to adjust to light. At birth, a newborn's eyesight is somewhere between 20/100 and 2/400, and their eyes are still developing. They will need time to build up the muscles in their eyes and acclimate to light.
The womb is dark, and birth provides a newborn's first exposure to direct light. Newborns need light to develop clearer vision, but they are extremely sensitive to UV and blue light during the first two months of life. Blue light, in particular, can be harmful to newborn babies and can destroy retina cells, leading to potential eyesight loss in the long term. Therefore, it is important to limit a newborn's exposure to blue light, especially before bedtime, as it can delay sleepiness and suppress melatonin production, affecting their circadian rhythm.
To support a newborn's developing eyesight and circadian rhythm, it is recommended to keep their sleeping environment as dark as possible at night. This helps signal to their bodies that it is time to sleep and encourages the production of melatonin, the sleep hormone. Darkness also helps to prevent stimulation that could disrupt their sleep.
During the day, it is beneficial to let your newborn nap in a light room to help establish their circadian rhythm. Exposing them to natural light during the day and keeping the room dark at night will help them learn the difference between day and night.
It is important to note that every baby is unique, and their sleep patterns and needs may vary. If you are concerned or struggling with your newborn's sleep, consider reaching out to a healthcare professional or sleep consultant for guidance.
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Darkness helps newborns produce melatonin, a sleep-inducing hormone
Darkness is essential for newborns to sleep well. Light, especially blue light, stimulates the brain and can delay the release of melatonin, a sleep-inducing hormone. Darkness, on the other hand, promotes the production of melatonin, which helps regulate sleep.
Newborns typically sleep for short periods throughout the day and night, ranging from 30 minutes to 4 hours at a time. During the day, it is recommended to let them nap in a light room to help establish their circadian rhythm. However, at night, it is beneficial to keep the room as dark as possible. Darkness helps signal to their bodies that it is time to sleep and prevents stimulation that could disrupt their sleep.
The production of melatonin is crucial for restorative sleep. When we sleep, our bodies go through different stages, including light sleep, deep sleep, and REM sleep. These stages are important for the body to repair itself, consolidate memories, and process emotions. Exposure to light, especially blue light, can disrupt these stages of sleep, leading to less restorative sleep.
Even small amounts of light, such as from a night light, can impact sleep quality. When melatonin levels are low, it is harder for newborns to fall asleep and stay asleep. Light can also lead to short naps and early morning wakings. For example, if a baby takes a nap in a room with light creeping under the door or through the curtains, they may not sleep as deeply or for as long as they would in a darker room.
To promote restorative sleep and ensure newborns get the best possible quality of sleep, it is recommended to keep their sleeping environment as dark as possible. This can be achieved by using room-darkening or blackout curtains to block out any outside light and light blockers for underneath doors. Additionally, it is important to avoid electronic devices that emit blue light before bedtime, as this can also disrupt melatonin production.
In summary, darkness helps newborns produce melatonin, which is essential for their sleep. By creating a dark and comfortable sleeping environment, parents can support their newborns in getting the restorative sleep they need for their growth and development.
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Blue light can be harmful to newborns' eyesight
Blue light is a high-energy light on the visible electromagnetic energy spectrum with a frequency similar to UV light. It is present in sunlight, artificial indoor lighting, smartphones, and other digital devices. While blue light is essential for good health—boosting alertness, memory, cognitive function, and mood—excessive exposure, especially at night, can negatively impact the body's circadian rhythm and sleep quality.
Impact on Newborns' Eyesight
Newborns' eyes are incredibly sensitive, and their eyesight is still developing. At birth, a newborn's eyesight is between 20/100 and 2/40, and their eyes may exhibit unusual movements. The eyes are complex organs, and it takes time for muscles to develop and acclimate to light. Additionally, newborns are extremely sensitive to UV and blue light during the first two months of life.
Excessive exposure to blue light can cause eye strain and affect newborns' developing eyesight. Blue light passes through the cornea and lens to reach the retina, causing damage and potentially leading to eye conditions such as dry eye, cataract, and age-related macular degeneration. It can also stimulate the brain, inhibit melatonin secretion, and enhance adrenocortical hormone production, disrupting hormonal balance and sleep quality.
Preventing Blue Light-Induced Eye Damage
To protect newborns' eyesight from the harmful effects of blue light:
- Minimize the use of digital devices, especially at night, to reduce blue light exposure.
- Use blue light filters or screen filters on smartphones, tablets, and computer screens to decrease blue light emission.
- Use computer glasses with yellow-tinted lenses to block blue light and reduce eye strain.
- Consider anti-reflective lenses, which block blue light while reducing glare and increasing contrast.
- Consult an eye care professional for advice on protecting newborns' eyes from blue light.
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Light can disrupt a newborn's sleep patterns
Light can have a significant impact on a newborn's sleep. Exposure to light, especially blue light, can stimulate newborns, making it harder for them to fall asleep or stay asleep. This is because light suppresses the production of melatonin, a sleep-inducing hormone that plays a large role in sleep and is highly dependent on light and darkness. Darkness, on the other hand, promotes sleep by encouraging the body to produce melatonin, which helps regulate sleep.
Newborns typically sleep for short periods throughout the day and night, ranging from 30 minutes to 4 hours at a time. During the day, it is recommended to let them nap in a light room to help establish their circadian rhythm. However, at night, it is beneficial to keep the room as dark as possible to signal to their bodies that it is time to sleep and prevent stimulation that could disrupt their sleep.
Even small amounts of light, such as from a night light, can impact a newborn's sleep quality. When melatonin levels are low due to light exposure, newborns may find it harder to fall asleep and may experience short naps and early morning wakings. Therefore, it is recommended to use blackout curtains or blinds to block out any external light sources and create a dark environment for restorative sleep.
The use of night lights is generally not recommended for newborns. Night lights can be stimulating and distracting, inhibiting melatonin production if the wrong colour is used. Blue light, found in sunlight and electronic devices, is particularly harmful as it stimulates the brain and delays sleepiness, affecting circadian rhythms. White light, while neutral for melatonin production, can trigger seizures in epileptic infants. Red light is the least disruptive to melatonin production, so if a night light is necessary, it should be dim and red.
In summary, light can disrupt a newborn's sleep patterns by suppressing melatonin production and stimulating their brains. To promote healthy sleep, it is best to create a dark environment, especially at night, and limit exposure to blue and white light.
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A night light may be useful for parents during nighttime care
If you do choose to use a night light, opt for a dim one with a warm-coloured glow, such as red, orange, or yellow. These colours are less likely to affect sleep and interfere with melatonin production compared to blue or white lights. You can also position the night light so that it doesn't shine directly on the baby, avoiding direct light exposure in their line of sight.
It is recommended to introduce a night light only when your baby or toddler specifically asks for it due to a fear of the dark. This usually occurs around the age of two or older when toddlers develop their imagination and are exposed to more things that can cause fear.
Additionally, it is important to gradually add light to your baby's sleep environment if you want to transition them to sleeping with the lights off. Start with dim lights and slowly increase the brightness to help them adjust.
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Frequently asked questions
No, newborns sleep better in the dark. Darkness helps signal to their bodies that it is time to sleep and encourages the production of melatonin, a hormone that regulates sleep.
Light, especially blue light, stimulates newborns' brains and can make it harder for them to fall and stay asleep. It also suppresses the production of melatonin, disrupting their circadian rhythm.
There is no need to introduce a night light until your baby is at least two years old and only if they ask for it due to a fear of the dark. If you do introduce a night light before this, ensure it is dim and red in colour, as red light is the least disruptive to melatonin production.
Use blackout curtains or blinds to block out any outside light. Identify other potential light sources, such as electronics, and cover or turn off any bright lights.
