Blue Light, ASD, and Children's Sleep: What the Science Says and How a Light Filter Can Help
If you have a child with Autism Spectrum Disorder (ASD), sleep is likely one of the biggest daily challenges you face. You are not alone: various studies estimate that between 50 and 80 percent of children with ASD have chronic sleep problems.
Difficulty falling asleep, frequent nighttime awakenings, or irregular sleep schedules are a reality for many families. And while sleep issues in children with ASD often have multiple causes, science points to one factor that we often overlook: the type of light to which the child is exposed in the afternoon and evening.
In this article, we explore what the current evidence shows and what practical changes can help create a more conducive environment for rest.
Why do children with ASD have more sleep problems?
One possible reason lies in melatonin, the hormone that regulates the sleep-wake cycle. Several studies have shown that many children with ASD have reduced levels of melatonin at night or disruptions in their circadian rhythm.
A review published in *Molecular Neurobiology* in 2025 (Bjørklund et al.) notes that these alterations in melatonin synthesis and regulation are associated with difficulties falling asleep and staying asleep in people with ASD.
In addition, a 2024 Spanish study (Martinez-Cayuelas et al., published in *Autism*) that analyzed 87 children with autism using actigraphy and distal temperature measurements found that children with ASD have longer sleep latency, poorer nighttime sleep efficiency, and altered circadian patterns compared to typically developing children.
The Role of Light in the Circadian Rhythm
The circadian rhythm—our internal biological clock—is extremely sensitive to light. In particular, high-energy light in the blue spectrum (approximately 450 to 490 nm) can inhibit melatonin production when exposed to it at night, signaling to the brain that it is still daytime.
This effect is well documented in the general population. In the case of children with ASD, who often exhibit disruptions in their circadian rhythm, it has been suggested that this sensitivity to light could have a significant impact, although further studies specifically focused on children are still needed.
An experimental study in an animal model of ASD published in *Neurobiology of Disease* in 2023 (Wang et al.) analyzed the effects of exposure to artificial light at night (even at low intensity). This type of exposure—known as “dim light at night”—has been associated in previous studies with sleep disturbances and disruptions to the circadian rhythm. In this study, the authors observed that replacing that light with longer-wavelength lighting—closer to warm/amber tones—reduced some of those effects in the animal model.
On the other hand, a recent review (Oner et al., 2025, *Building and Environment*) notes that the relationship between indoor lighting and sleep in people with ASD is an emerging field with still limited evidence, but that adjusting nighttime lighting is an intervention strategy of growing interest within a broader approach.
What can we do? Blue light filters and warm-toned lighting
The good news is that there are simple, affordable tools that can help reduce the impact of light in the hours leading up to your child's bedtime.
Blue Light Filter Glasses for Children
The blue light glasses for children at night are designed with amber or orange-tinted lenses that reduce exposure to high-energy blue light. Wearing them in the evening and at night—for example, while watching TV or using electronic devices—can help reduce the interference of artificial light with the body’s natural production of melatonin.
For daytime use, especially for children who use computers or tablets, blue light glasses for children during the day with clear or slightly yellow lenses can help reduce eye strain without interfering with the sleep-wake cycle.
Switch Your Home Lighting to Warm Tones
Another key change is to adjust the lighting in your home starting in the afternoon. Replacing white or cool-toned LED bulbs with warm-toned (2700K or lower), amber, or red lighting reduces stimulation of the melanopsin-sensitive retinal ganglion cells, which play a role in regulating the biological clock.
The combination of reducing bright artificial light at night and using warm colors in the environment is one of the strategies most consistent with current evidence on circadian rhythm regulation.
Small changes in the environment can have a cumulative impact, especially on children with heightened sensory sensitivity, as is often the case with ASD.
Practical Recommendations for Families
Based on the available evidence, here are some guidelines you can implement gradually:
- 2–3 hours before bedtime: Switch the lighting in common areas to warm lights (2700K or less), amber, or red.
- In the late afternoon and evening: If you're going to be using screens, consider wearing blue-light-filtering glasses at night.
- During the day: If you use digital devices frequently, daytime glasses can help reduce eye strain.
- Avoid screens in the bedroom at least 1 hour before bedtime.
- Establish consistent light and dark routines: stable and predictable environmental cues can help prepare the body for rest.
A complementary tool, not a treatment
It is important to note that blue light filters and modifications to the lighting environment are complementary strategies. They should be integrated into a broader approach to sleep in children with ASD, which may include behavioral interventions, structured routines, and, in some cases, medical treatment.
Clinical guidelines on the management of insomnia in children with ASD (Kotagal et al., 2024, *Sleep Medicine*) emphasize that sleep hygiene measures—such as consistent sleep schedules, the sleep environment, and pre-sleep stimuli—are part of the first level of intervention before considering other options.
It's always a good idea to work closely with your child's pediatrician, pediatric neurologist, or sleep specialist.
At Apricotte we design blue light-filtering glasses for children with every type of child and every need in mind. Because a better night’s sleep is the foundation of a better day—for them and for the whole family.
References: Wang HB et al. (2023). Long-wavelength light reduces the negative consequences of dim light at night. Neurobiology of Disease, 176:105944. | Oner M et al. (2025). Effects of evening indoor light exposure on sleep and circadian functioning in people with autism. Building and Environment. | Bjørklund G et al. (2025). Melatonin interventions in autism spectrum disorder. Molecular Neurobiology. | Martinez-Cayuelas E et al. (2024). Sleep problems and circadian rhythm functioning in autistic children. Autism. | Kotagal S et al. (2024). Melatonin use in managing insomnia in children with autism. Sleep Medicine.
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