Colin Snow
A good night's sleep is essential for our health and well-being, and creating the right environment can help us achieve that. One of the key factors in optimising our sleep is darkness. Our bodies are programmed to respond to light and dark, and even a small amount of light can disrupt our sleep. This is because light affects the production of melatonin, the hormone that regulates our sleep. So, is it better to sleep in absolute darkness? Let's explore the benefits and impact of sleeping in a dark environment.
| Characteristics | Values |
|---|---|
| Quality of sleep | Sleeping in complete darkness can improve sleep quality. |
| Light sources | Light from outside, digital screens, and artificial light can disrupt sleep. |
| Health benefits | Sleeping in darkness can lower risks of heart disease, early death, depression, type 2 diabetes, certain cancers, and obesity |
| Melatonin production | Darkness allows the pineal gland to produce and secrete melatonin, a hormone responsible for good sleep hygiene, boosting mood and immune system, and improving brain and eye health. |
| Tools for darkness | Blackout curtains, sleep masks, and red/amber nightlights can aid in creating a dark environment. |
| Adjusting to darkness | Adjusting to total darkness may take time, but it can help to ease into it with a soothing nighttime routine and a zen bedroom space. |
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What You'll Learn
Light disrupts melatonin production
The body operates on a light-dark cycle, with light promoting wakefulness and darkness promoting sleep. When light hits our eyelids, it activates receptors that reduce melatonin, leading to awakening. The pineal gland in our brain is responsible for releasing and regulating melatonin. However, light in the bedroom disrupts the pineal gland's ability to produce the optimal amount of melatonin necessary for a good night's sleep.
Research has shown that even a moderate amount of light exposure while sleeping can lead to increased heart rate and insulin resistance, which are risk factors for heart disease and early death. Light exposure at night has also been linked to adverse health effects, including an increased risk of depression, type 2 diabetes, and certain types of cancer.
To ensure optimal melatonin production and a good night's sleep, it is essential to create a dark environment. This can be achieved through the use of blackout curtains, sleep masks, or red nightlights, which have been shown to promote neuron growth without disrupting melatonin production.
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Light affects metabolic health
Light is an essential part of many life forms. The natural light-dark cycle has been the dominant stimulus for circadian rhythms throughout human evolution. However, artificial light has restructured human activity, providing opportunities to extend the day without relying on natural day-night cycles. This increase in light exposure at unwanted times or a reduced dynamic range of light between daytime and nighttime has introduced negative consequences for human health.
Light exposure is closely linked to sleep-wake regulation, activity and eating patterns, body temperature, and energy metabolism. Disruptions to these areas due to light are linked to metabolic abnormalities such as an increased risk of obesity and diabetes. Research has revealed that various properties of light influence metabolism.
Studies have shown that exposure to light at night, or light pollution, has negative effects on health. One study found that bedroom brightness was significantly associated with an increased risk of high BMI and obesity in women. Another study of older individuals with and without diabetes found that ambient light intensity in the evening before bed from 17.5 to 37.6 lux was associated with a 51% increase in the prevalence of diabetes. Artificial light at night during sleep was also significantly associated with an increased risk of weight gain and obesity in women.
On the other hand, exposure to light during the day promotes health. Bright light exposure shortly after awakening in the morning has been used as a treatment for individuals with seasonal affective disorder (SAD) and winter depression, potentially alleviating adverse metabolic states. Morning light therapy has also been shown to have beneficial effects on daily rhythms, metabolic state, and affect. In one study, sand rats subjected to morning light treatment demonstrated daily rhythms with high peak-to-trough differences in activity, blood glucose levels, and per2 gene expression in the suprachiasmatic nucleus, pre-frontal cortex, kidney, and liver. The treated animals were also healthier, with lower body and heart weight and lower anxiety and depression-like behavior.
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Light at night is linked to adverse health effects
ALAN has been linked to an increased risk of obesity, with a large study of 43,722 women finding that those who slept with artificial light had a higher risk of gaining weight. Another study of over 100,000 teachers in California revealed that women in areas with the most light pollution had a 12% higher risk.
Research has also found a correlation between ALAN and an increased risk of depression. This may be due to the disruption of melatonin production, as melatonin is a hormone that regulates sleep and can improve mood.
ALAN has also been associated with an increased risk of diabetes. In a recent study, people living in the most illuminated areas had a 28% higher risk of diabetes than those in darker places. Additionally, scientists concluded that 9 million cases of diabetes in China could be linked to light pollution.
Furthermore, exposure to artificial light at night has been linked to an increased risk of certain types of cancer, particularly breast cancer. This may be due to the disruption of melatonin, as melatonin has been shown to have potential anti-cancer properties.
In addition to the health risks mentioned above, ALAN has also been linked to other negative effects on human health, including sleep disorders, heart disease, Alzheimer's disease, and low sperm quality.
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Darkness can reduce anxiety
This is supported by a study from Northwestern University, which found that adults exposed to even a small amount of light while sleeping experienced higher heart rates than when they slept in a dark room. The study also showed that sleeping with the light on led to increased insulin resistance in the morning, meaning their bodies had to work harder to regulate their blood sugar.
The study's co-author, Phyllis Zee, M.D., director of the Center for Circadian and Sleep Medicine at Northwestern University Feinberg School of Medicine, said that "light during sleep is affecting you, even if you’re not aware of it... Your subconscious is aware that there’s light and there’s something going on, and it’s keeping you a little bit on watch."
Zee also noted that previous studies have linked light exposure at night to a variety of health problems, including an increased risk of depression, type 2 diabetes, and some types of cancer. Additionally, a large study of 43,722 women found that those who slept with artificial light had a higher risk of gaining weight and obesity than those who slept in the dark.
To achieve total darkness, you can invest in blackout curtains, sleep masks, or even try duct taping garbage bags over your windows, as one person on Reddit suggested.
However, it's important to note that some people may find adjusting to total darkness scary or uncomfortable. If this is the case, you can try gradually easing yourself into it by starting with a dim nightlight and gradually reducing the light over time.
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Light pollution can disrupt sleep
The body operates on a light-dark cycle, with light promoting wakefulness and darkness promoting sleep. When light hits our eyelids, it activates receptors that reduce melatonin, a hormone responsible for good sleep hygiene. Darkness allows the brain to release melatonin quicker, so we can fall asleep faster.
Research has shown that adults exposed to even a moderate amount of light during sleep experienced higher heart rates and more insulin resistance the next morning. Light exposure at night has also been linked to an increased risk of depression, type 2 diabetes, and certain types of cancer.
To mitigate light pollution, one can use blackout curtains, sleep masks, or red nightlights, which have been shown to promote neuron growth and not disrupt melatonin production. Creating an environment conducive to sleep, such as a serene bedroom with soothing colours, can also help improve sleep quality.
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Frequently asked questions
Yes, sleeping in a dark room is better for your health. Light can disrupt your internal clock and affect your body's ability to produce melatonin, the hormone responsible for good sleep.
To achieve absolute darkness, you can use blackout curtains, sleep masks, or even duct tape over any sources of light.
Yes, sleeping in a dark room has been linked to improved metabolic health, reduced insulin resistance, and a lower risk of depression, type 2 diabetes, and certain types of cancer.
It may take some time to adjust to sleeping in total darkness. You can start by creating a soothing nighttime routine, such as drinking chamomile tea, reading, or practicing meditation before bed.
Yes, if you cannot achieve complete darkness, you can opt for dim red or amber lighting, which are less stimulating for the brain and have been shown to promote neuron growth.
