Gina Johnson
Light exposure at night can affect our sleep, and blue light in particular has been shown to suppress melatonin production, making it harder to fall asleep and stay asleep. While sleeping in complete darkness is best for health, red light before bed can improve sleep quality and increase daytime alertness. Red light has a longer wavelength and is less likely to interfere with the circadian rhythm, and some studies have shown that red light can reduce sleep-awake cycle disruption at night. However, red light may not enhance sleep quality, and could even disturb sleep if you're used to sleeping in the dark.
| Characteristics | Values |
|---|---|
| Effect on sleep | Red light does not interfere with sleep like blue light and may improve sleep quality. |
| Effect on melatonin production | Red light stimulates the secretion of melatonin, the hormone responsible for making us sleepy. |
| Effect on sleep inertia | Red light reduces sleep inertia, the groggy feeling upon waking. |
| Effect on heart health | Sleeping with a light on has been linked to an increased risk of heart disease. |
| Effect on weight | Sleeping with a light on has been associated with weight gain and obesity. |
| Effect on diabetes | A small study found a link between sleeping with a light on and insulin resistance, a risk factor for diabetes. |
| Effect on mood | Red light may induce arousal and negative emotional experiences. |
| Effect on alertness | Red light increases alertness in those working night shifts. |
| Effect on vision | Red light is non-glaring and helps you see better at night. |
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What You'll Learn
Red light stimulates melatonin production, aiding sleep
While sleeping in complete darkness is considered the healthiest option, using red light before going to bed can improve sleep quality. Red light stimulates melatonin production, which is the hormone responsible for making us sleepy. It also improves muscle regeneration, which helps with muscle gain. This helps improve sleep quality and, therefore, improves performance throughout the day.
Red light therapy has gained popularity for its benefits in skincare and skincare devices, but its effects on sleep are less known. The relationship between light and sleep is complex and essential to human biology, as it is intricately linked to our circadian rhythm. This internal clock, also known as the biological clock, orchestrates our sleep-wake cycle, aligning it with the 24-hour day-night cycle. Different types of light can affect this rhythm, as well as our sleep patterns and overall well-being.
The biological clock is more sensitive to light in the two hours before bedtime, as well as for about an hour after waking up. Blue light, a type of artificial light found in fluorescent bulbs, LED lights, and electronic screens, has the strongest impact on the biological clock and sleep. Exposure to blue light before bed can make it difficult to fall asleep or stay asleep. Blue light suppresses melatonin production, making it harder to fall asleep and stay asleep.
Red light, on the other hand, has a longer wavelength and is less likely to interfere with the circadian rhythm. It does not suppress melatonin production to the same extent as blue light. Instead, red light stimulates the secretion of melatonin, aiding sleep. This makes red light a more suitable option for evening use, as it is less likely to disrupt the natural sleep process.
However, it is important to note that red light should not be too bright, as it can suppress melatonin production at higher intensities. Additionally, while red light is a better option than blue light, it may not necessarily enhance sleep quality compared to complete darkness. Some studies suggest that red light may not provide any sleep benefits and could even disturb sleep for those accustomed to sleeping in the dark. Nonetheless, red light is a good choice for a night light, especially for children or adults who are afraid of the dark, as it provides enough light to see without disrupting sleep.
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Blue light before bed suppresses melatonin, making sleep difficult
While red light at night does not seem to interfere with sleep, blue light does. Blue light suppresses the body's release of melatonin, a hormone that makes us feel drowsy. This promotes wakefulness during the day, but it becomes unhelpful at night when we are trying to sleep. Exposure to blue light in the hours leading up to bedtime can trick our brains into thinking it is still daytime, disrupting our circadian rhythms and leaving us feeling alert instead of tired.
Chronic misalignment of circadian rhythms can lead to negative health impacts, and research has shown that short sleep is linked to an increased risk for depression, diabetes, and cardiovascular problems. Blue light has the largest impact on our circadian rhythms, and we get most of our exposure to it from the sun. Blue light stimulates parts of the brain that make us feel alert, elevating our body temperature and heart rate. During the day, blue light can improve performance and attention, but at night, it becomes disruptive.
To support optimal sleep patterns, it is beneficial to seek bright, natural light during the day and minimize exposure to bright, artificial light in the evening as you wind down for bed. This can be achieved by using dim, warm-coloured lights and avoiding screens at least an hour before bedtime. Blue-blocking glasses can also be worn to reduce the melatonin-suppressing effects of bright light.
Red light, on the other hand, has a longer wavelength and is less likely to interfere with the circadian rhythm. It stimulates the secretion of melatonin, improving sleep quality and performance throughout the day. Red light does not have the wakefulness effect of blue light, making it a better option for evening use.
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Red light before bed improves sleep quality
While sleeping in complete darkness is considered the healthiest option, red light before bed can improve sleep quality.
Red light stimulates the secretion of melatonin, the hormone responsible for making us sleepy. It also improves muscle regeneration, which helps with muscle gain. This helps improve sleep quality and, therefore, improves performance throughout the day.
Red light doesn't have the same wakefulness effect as blue light, which is emitted by electronic devices such as mobile phones, laptops, and TVs. Blue light suppresses melatonin production, making it harder to fall asleep and stay asleep. It also enables the circadian rhythm to help the body maintain alertness, tricking the body into thinking it is still daytime. For this reason, it is recommended to avoid blue light and opt for red light instead in the evening.
However, it is worth noting that red light should not be too bright, as this can suppress melatonin production. While red light is less disruptive to melatonin production than blue light, it does not necessarily enhance sleep quality either. Some studies have also suggested that red light may induce arousal and negative emotional experiences, as well as increase arousal levels and alertness.
To improve sleep, it is recommended to reduce exposure to blue light and bright LEDs and bulbs before bed. Instead, opt for dim, warm-coloured lights such as red, orange, or yellow.
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Sleeping with red lights on may negatively impact heart health
While red light is generally considered to be beneficial for sleep, there are some potential drawbacks to consider. One concern is the impact on heart health. Preliminary research suggests that even a dim light during sleep can affect heart function, with potential negative consequences.
Sleeping with a light on has been linked to an increased heart rate and a higher risk of high blood pressure in certain groups, which can contribute to a greater chance of developing heart disease. This is a serious concern, as heart disease is a leading cause of death worldwide. Therefore, it is essential to consider the potential risks before deciding to sleep with red lights on.
While red light is less likely to interfere with melatonin production than blue light, it may not necessarily enhance sleep quality. Some studies suggest that red light can increase alertness and arousal levels, which could negatively impact sleep. Additionally, red light may not provide any significant sleep benefits, and leaving it on overnight could create an unnecessary light source that disturbs sleep, especially for those accustomed to sleeping in complete darkness.
The impact of red light on sleep is complex and not fully understood. While it may help reduce sleep inertia, the groggy feeling upon waking up, it is important to note that any type of light, including red light, can disturb sleep if it is too bright or shining directly into your face. Therefore, it is generally recommended to minimise light exposure during sleep and create a dark environment to promote optimal sleep and reduce potential heart health risks.
To improve sleep quality, it is advisable to avoid blue-light emitting devices such as mobile screens, laptops, and TVs before bed. Instead, opt for dim, warm-coloured lights, such as red, orange, or yellow, which are less likely to interfere with melatonin production and disrupt the natural sleep process. Exposing yourself to bright, natural light during the day and minimising artificial light exposure in the evening can also help regulate your sleep-wake cycle.
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Red light is less likely to disrupt the sleep-wake cycle
Red light has a longer wavelength and is less likely to interfere with the circadian rhythm, which is the internal process that regulates the sleep-wake cycle. The circadian rhythm repeats roughly every 24 hours, aligning with the day-night cycle.
The biological clock is more sensitive to light in the two hours leading up to bedtime, throughout the night, and for about an hour after waking up. Blue light, which is a type of artificial light found in electronic screens, has the strongest impact on the biological clock and sleep. Blue light suppresses melatonin production, making it harder to fall asleep and stay asleep.
Red light, on the other hand, stimulates the secretion of melatonin, the hormone responsible for making us sleepy. It also improves muscle regeneration, which helps with muscle gain and improves overall sleep quality. This is why red lights are often used in places like airplane cockpits and submarines, and by astronomers and stargazers.
While red light is generally considered less disruptive to sleep, some sources suggest that it may not necessarily enhance sleep quality either. Red light has been associated with increased alertness, and some studies suggest it may not provide any sleep benefits, or could even disturb sleep for those who are used to sleeping in the dark.
Overall, while red light is less likely to disrupt the sleep-wake cycle, it is still recommended to sleep in complete darkness if possible, and to expose yourself to natural light during the day.
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Frequently asked questions
While red LED lights are less likely to interfere with your sleep than blue lights, it is still best to sleep in complete darkness. However, red light before bed can improve sleep quality.
Red light stimulates the secretion of melatonin, the hormone responsible for making us sleepy. It also improves muscle regeneration, which helps with muscle gain.
If you want to try red light therapy for better sleep, choose products that emit red light wavelengths instead of bulbs that are simply tinted red.
It is best to seek bright, natural light during the day to stay alert and minimise exposure to bright, artificial light in the evening as you wind down for bed.
Light plays a key role in our circadian rhythm, our internal 24-hour clock that helps us feel sleepy at night and alert during the day. Red light does not affect the circadian system, but it may affect parts of the brain associated with the visual system.
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