Evie Summers
Red light therapy has been found to be helpful for skin health, wound healing, hair growth, and pain management. Some have also claimed it is useful for sleep. However, experts and limited research suggest that red light does not promote sleep. Instead, it is less disruptive than other types of light. Red light does not suppress melatonin, a hormone that helps you sleep, and can thus be used before sleep to minimize the disruption of the circadian system. It is also non-glaring, helping you see better at night.
| Characteristics | Values |
|---|---|
| Circadian Rhythm Disruption | Red light does not disrupt the body's internal clock controlling sleep and wake cycles |
| Melatonin Suppression | Red light does not suppress melatonin, a hormone that aids sleep |
| Alertness | Red light does not induce alertness |
| Visual Comfort | Red light is non-glaring and helps with visibility at night |
| Mood | Red light may improve mood |
| Sleep Quality | Red light improves sleep quality |
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What You'll Learn
Red light doesn't suppress melatonin production
Red light therapy is a popular topic of discussion, with some claiming it improves sleep quality. However, it is important to distinguish between the absence of disruption to the circadian system and the active promotion of sleep. While red light does not suppress melatonin production, and thus does not disrupt the body's internal clock, it also does not actively promote sleep.
The stimulation of melatonin production is often conflated with improved sleep. Melatonin is a naturally occurring hormone that aids sleep. Blue light, emitted from artificial lights and electronic screens, suppresses melatonin production, disrupting the sleep-wake cycle. In contrast, red light does not suppress melatonin production and is therefore less disruptive to the body's sleep-wake cycle.
Red light has a lower energy output than other colours of light, including blue light, due to its longer wavelength. This means that red light is non-glaring and can help improve visibility at night without causing the same squinting and straining that brighter lights can induce. This property of red light is why it is often used in airplane cockpits and submarines, as well as by astronomers and stargazers.
While red light does not suppress melatonin production, it is important to note that it may still affect sleep. Some studies suggest that red light can induce arousal and negative emotional experiences, increasing arousal levels and alertness. Therefore, while red light may be less disruptive to the body's internal clock, it may not be the best option for those seeking to improve their sleep quality.
In summary, red light does not suppress melatonin production and can be less disruptive to the body's sleep-wake cycle than other forms of light. However, it is important to understand that this does not necessarily translate to improved sleep quality, as red light may have other effects on the brain and can potentially induce alertness through pathways other than the biological clock.
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Red light is non-glaring and doesn't strain the eyes
Red light has the lowest energy of all colours of light. It has a longer wavelength than blue light, which means it carries less energy. Blue light has a shorter wavelength and thus carries higher energy. This higher energy can be straining on the eyes, especially in the dark, as the sudden exposure to bright light can cause squinting and strain.
The human brain associates blue light with daytime and being awake, and red light with nighttime and sleep. This is because, in nature, the sun provides blue light during the day and orange/red light at sunset. Our ancestors' campfires also provided a warm red glow at night, signalling to the brain that it was time for sleep.
Red light is also thought to stimulate the production of melatonin, the hormone that helps us sleep. This is why red light is often recommended for night lights, as it won't disrupt sleep in the way that blue light does.
While red light is better for the eyes than blue light, it is important to remember that any type of light can disturb your sleep if it's bright enough or shining into your face. Experts agree that the healthiest way to sleep is in complete darkness, with no light at all.
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Red light is less disruptive to sleep than other types of light
The human body's internal clock, which controls sleep and wake cycles, responds to light as a signal to be awake and to darkness as a signal to fall asleep. Light pollution, which includes white and coloured light pollution and sky glow, can delay sleep onset, increase nighttime awakenings, and reduce total sleep time. Blue light, in particular, can make it harder to fall asleep and stay asleep as it suppresses melatonin, the hormone that helps us sleep.
Red light, on the other hand, has the lowest energy of all colours of light and does not suppress melatonin production. Studies have shown that red light administered through closed eyelids can help ease sleep inertia, the groggy feeling we get when we wake up. It is also non-glaring, making it easier to see at night. For this reason, red lights are used in airplane cockpits and submarines, and by astronomers and stargazers.
While red light does not necessarily promote sleep, experts agree that it is less disruptive than other types of light. If you need to keep a light on while you sleep, a red light will be more conducive to sleep. However, it is important to note that the healthiest way to sleep is in complete darkness, as this mimics the natural environment, where there is no light after sunset.
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Red light helps reduce sleep inertia
Red light has been found to be beneficial for sleep, particularly in reducing sleep inertia. Sleep inertia is the feeling of grogginess and disorientation that occurs when you wake up. It can take some time before you feel fully alert. Red light therapy has been shown to help ease this sleep inertia upon waking.
Red light has a low tendency to suppress melatonin, a hormone that helps us sleep. By not suppressing melatonin, red light administered through closed eyelids may help to ease sleep inertia. This is because red light has the lowest energy out of all colours of light, with blue light, for example, having a shorter wavelength and higher energy.
The circadian rhythm, or the body's internal clock, controls our sleep and wake cycles. Blue light, emitted from artificial lights and electronic screens, can disrupt the circadian rhythm and make it harder to fall asleep. Blue light wavelengths can stop the brain from producing melatonin. In contrast, red light does not affect the circadian system in the same way and is therefore less disruptive.
Using red light before going to bed can improve sleep quality. This is because red light makes the brain believe it is time for bed and induces sleep. In ancient times, the warm red glow from campfires at night helped our ancestors fall asleep. Today, red light can be used in the same way to signal to the brain that it is time to sleep.
While red light can be beneficial for sleep, it is important to note that the healthiest way to sleep is in complete darkness, as this mimics the natural environment after sunset. However, if you need to have a light on while you sleep, red light is a good option as it is less disruptive than other types of light.
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Red light is better than blue light before sleep
While red light therapy has been found to be beneficial for skin health, wound healing, hair growth, and pain management, its impact on sleep is still debated. Circadian rhythms, or the body's internal clock, respond to light as a signal to be awake and to darkness as a cue to sleep.
Red light is believed to be less disruptive to the circadian system than blue light, which can hinder sleep by suppressing melatonin production and increasing alertness. Melatonin is a hormone that helps regulate sleep. By replacing blue light with red light before sleep, individuals may minimize circadian disruption and improve sleep quality.
Additionally, red light is non-glaring and provides better visibility at night, making it a preferred choice in low-light settings. However, it is important to note that any bright light, including red light, can disturb sleep if it shines directly into the face.
While red light may be more conducive to sleep than blue light, the ideal sleeping environment is complete darkness. This mimics the natural absence of light after sunset. Nevertheless, for those who require some form of illumination, red light is a preferred option as it may help reduce sleep inertia and improve overall sleep quality.
In summary, while red light may not directly promote sleep, it is less disruptive to the body's circadian rhythms than blue light. Therefore, when light is necessary, red light is a better option before sleep as it may help improve sleep quality and ease the transition from sleep to wakefulness.
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Frequently asked questions
Red light is better for sleep because it doesn't suppress melatonin, a hormone that helps you sleep, as much as blue or white light.
Red light doesn't affect the body's internal clock or circadian rhythm as much as other types of light.
Red light can improve sleep quality and reduce sleep inertia, the groggy feeling you get when you wake up.
If you need to have a light on while you sleep, use a dim red night light. Also, avoid blue light from electronic devices before bed as it can disrupt your sleep-wake cycle.
