Getting quality sleep during a layover at an airport can be challenging, especially due to the pervasive blue light from artificial lighting and electronic devices. Blue light exposure can disrupt your circadian rhythm and reduce sleep quality by inhibiting melatonin production.
Here are expert strategies to manage blue light exposure effectively and improve your chances of getting restful sleep in an airport.
What is Blue Light?
Blue light is part of the light spectrum that we can see. It’s all around us during the day, especially from the sun, and also comes from screens like our phones, computers, and even some light bulbs.
Blue light, a segment of the visible light spectrum with wavelengths between 400 to 500 nm, is emitted by natural sources like sunlight and artificial sources such as LED lights, digital screens, and fluorescent lighting. While blue light has beneficial effects on alertness and cognitive performance, its impact on sleep, particularly during airport layovers, can be detrimental.
Benefits of Blue Light
Blue light can enhance cognitive performance, increase alertness, decrease reaction times, and improve overall well-being . These benefits are advantageous during daytime hours but counterproductive when trying to sleep during a layover.
Negative Effects of Blue Light on Sleep
The adverse effects of blue light on sleep are well-documented:
- Decreased Sleep Quality: Exposure to blue light before sleep reduces sleep quality by delaying the onset of sleep and causing more frequent awakenings .
- Reduced Sleep Duration: Studies have shown that blue light exposure leads to shorter total sleep time, affecting overall restfulness .
- Increased Sleep Latency: Blue light exposure increases the time it takes to fall asleep by inhibiting melatonin production .
- Lower Sleep Efficiency: The efficiency of sleep, or the percentage of time spent asleep while in bed, is decreased by blue light exposure .
How Blue Light Impact Sleep:
1. Impact on Melatonin Production
Melatonin is a hormone produced by the pineal gland in the brain. It helps regulate the sleep-wake cycle, signaling to your body that it’s time to sleep.
- Inhibition by Blue Light: Blue light exposure, particularly in the evening, can inhibit the production of melatonin. This happens because blue light is especially effective at stimulating photosensitive cells in the retina called intrinsically photosensitive retinal ganglion cells (ipRGCs).
- Role of ipRGCs: These cells send signals to the suprachiasmatic nucleus (SCN) in the hypothalamus, the brain’s master clock, which regulates circadian rhythms. When ipRGCs are stimulated by blue light, they signal the SCN to suppress melatonin production.
2. Disruption of Circadian Rhythms
Circadian rhythms are 24-hour cycles that govern various physiological processes, including sleep-wake cycles.
- Effect of Light on SCN: Blue light exposure in the evening shifts the timing of the circadian rhythm, making it harder to fall asleep at the desired time. This shift is called a “phase delay.”
- Impact on Sleep Patterns: Disrupted circadian rhythms can lead to irregular sleep patterns, making it difficult to maintain a consistent sleep schedule.
3. Increased Alertness and Cognitive Stimulation
Blue light can enhance alertness and cognitive function, which is beneficial during the day but counterproductive at night when trying to sleep.
- Activation of Alertness: Exposure to blue light increases the release of hormones like cortisol, which is associated with stress and alertness.
- Cognitive Activation: The stimulating effect of blue light can make it harder to relax and wind down, further delaying sleep onset.
4. Research Evidence
Numerous studies have documented the impact of blue light on sleep:
- Study on Melatonin Suppression: Research shows that exposure to blue light (480 nm) can suppress melatonin production more effectively than other wavelengths of light .
- Effect on Sleep Latency: Studies indicate that using devices emitting blue light before bedtime increases the time it takes to fall asleep (sleep latency).
- Impact on Sleep Quality: Blue light exposure has been linked to poorer sleep quality, characterized by more frequent awakenings and less restorative sleep.
More Research Findings
Studies have shown that blue light exposure can lead to various sleep disturbances:
- Sleep Onset and Duration: Research indicates that blue light exposure decreases sleep duration and delays sleep onset .
- Sleep Quality: Studies have found mixed results regarding sleep quality, with some showing improvement in non-blue light conditions and others indicating no significant difference .
- Sleep Efficiency and Latency: Research highlights that blue light reduces sleep efficiency and increases sleep latency, with individuals taking longer to fall asleep and experiencing fragmented sleep .
How to Mitigate Negative Effects of Blue Light on Sleep:
To mitigate the negative effects of blue light on sleep during layovers, several strategies can be employed:
1. Use Blue Light Blocking Glasses
Blue light blocking glasses are designed to filter out the blue light wavelengths emitted by artificial sources. These glasses can significantly reduce the impact of blue light on melatonin production and help maintain your circadian rhythm.
- Benefits: Wearing blue light blocking glasses can improve sleep efficiency and reduce sleep latency (the time it takes to fall asleep).
- Usage: Put on these glasses at least two hours before you plan to sleep to block out blue light effectively.
2. Utilize Screen Filters and Night Mode Settings
Many electronic devices come with built-in blue light filters or “night mode” settings that reduce blue light emissions by adjusting the screen’s color temperature.
- Benefits: Reducing blue light emissions from screens can help maintain your melatonin levels and promote better sleep.
- Usage: Activate night mode or blue light filters on your devices well before your planned sleep time. Consider installing additional apps that provide more control over blue light emissions if your device does not have these features built-in.
3. Limit Screen Time Before Sleep
Minimize your use of electronic devices at least one hour before you intend to sleep. This reduces blue light exposure and helps your body prepare for sleep.
- Benefits: Less exposure to blue light in the hour leading up to sleep can prevent disruptions in melatonin production and improve sleep quality.
- Usage: Engage in non-screen activities such as reading a book, listening to music, or practicing relaxation techniques.
4. Find Dimly Lit Areas
Seek out areas in the airport that are dimly lit or have adjustable lighting. Many airports have lounges, quiet zones, or designated sleep areas with subdued lighting.
- Benefits: Reduced ambient lighting can help signal to your body that it is time to sleep, aiding in the natural production of melatonin.
- Usage: Identify and move to these areas well before you plan to sleep. Use sleep masks if you cannot find an adequately dark spot.
5. Use Sleep Masks
A sleep mask can effectively block out light from your surroundings, including blue light, and create a dark environment conducive to sleep.
- Benefits: Sleep masks help maintain darkness around your eyes, which is crucial for melatonin production and sleep quality.
- Usage: Choose a comfortable, well-fitting sleep mask and wear it as you settle down to sleep.
6. Opt for Physical Books or Audio Content
Instead of using digital devices, read physical books or listen to audiobooks or podcasts. This minimizes exposure to blue light and still provides entertainment or relaxation.
- Benefits: Avoiding screens reduces blue light exposure, helping your body prepare for sleep.
- Usage: Carry a book or download audio content in advance to have offline access during your layover.
7. Adjust Your Environment
If possible, control your immediate environment to reduce blue light exposure. This can include adjusting the brightness settings of nearby screens or using portable room dividers or curtains to block light.
- Benefits: Creating a more sleep-friendly environment can improve the quality of your rest.
- Usage: Use available resources in your carry-on luggage to modify your surroundings, such as a lightweight travel curtain or a scarf to block light.
8. Stay Hydrated and Avoid Stimulants
Hydration plays a role in overall comfort and sleep quality. Additionally, avoid consuming caffeine and other stimulants, as they can interfere with your ability to fall asleep.
- Benefits: Staying hydrated and avoiding stimulants helps maintain your body’s natural sleep processes.
- Usage: Drink water regularly and avoid coffee, tea, or energy drinks a few hours before you plan to sleep.
By implementing these strategies, you can effectively manage blue light exposure and improve your chances of getting quality sleep during a layover in an airport. Proper preparation and the right tools can make a significant difference in your overall travel experience.
And finally..
Blue light exposure in airports can significantly impair sleep quality and duration during layovers by disrupting the body’s circadian rhythm and melatonin production. Implementing preventive strategies such as blue light blocking glasses and screen filters can help travelers manage these effects, promoting better rest and overall well-being during their journeys.
References
- Coats JG, Maktabi B, Abou-Dahech MS, Baki G. Blue Light Protection, Part I-Effects of blue light on the skin. J Cosmet Dermatol. 2021 Mar;20(3):714-717.
- Silvani M.I, Werder R, Perret C. The influence of blue light on sleep, performance and wellbeing in young adults: A systematic review. Frontiers in Physiology. 2022:13:1-21.
- Alkozei A, Smith R, Pisner DA, Vanuk JR, Berryhill SM, Fridman A, Shane BR, Knight SA, Killgore WD. Exposure to Blue Light Increases Subsequent Functional Activation of the Prefrontal Cortex During Performance of a Working Memory Task. Sleep. 2016 Sep 1;39(9):1671-80.
- Do A, Li VW, Huang S, Michalak EE, Tam EM, Chakrabarty T, Yatham LN, Lam RW. Blue-Light Therapy for Seasonal and Non-Seasonal Depression: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Canadian Journal of Psychiatry. 2022:67(10):745-754.
- Zhao Z-C, Zhou Y, Tan G, Li J. Research progress about the effect and prevention of blue light on eyes. International Journal of Ophthalmology. 2018:11(12):1999-2004.
- Wahl S, Engelhardt M, Schaupp P, Lappe C, Ivanov IV. The inner clock-Blue light sets the human rhythm. J Biophotonics. 2019 Dec;12(12).
- Kessel L, Siganos G, Jørgensen T, Larsen M. Sleep disturbances are related to decreased transmission of blue light to the retina caused by lens yellowing. Sleep. 2011:34(9):1215-1219.
- Hester L, Dang D, Barker C.J, Heath M, Mesiya S, Tienabeso T, Watson K. Evening wear of blue-blocking glasses for sleep and mood disorders: a systematic review. The Journal of Biological and Medical Rhythm Research. 2021:1-10.