You may have heard that you should avoid bright lights before bed. While this is good advice, it turns out that some colors of light may disrupt your sleep more than others.
Your body natural sleep-wake cycles are largely controlled by a hormone called melatonin. Specialized photoreceptors in your eyes send information back to your brain and influence your production of melatonin.
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There’s still a limited amount of research looking at the effects of other light colors on our sleep cycles. However, there’s some evidence that warm colors may help lull you to sleep more quickly than cool colors.
Let’s take a look at which colors have the potential to lull you to sleep the quickest and which might have you tossing and turning all night.
Up until now, most studies examining the best types of lights to stimulate sleep have been performed on rodents. However, because rodents are nocturnal and color-blind, it’s hard to draw conclusions from these studies.
Limited research of humans has suggested some evidence that red light may help stimulate sleep. There’s also some evidence that individual preference may also play a role.
Since pink light is made up of a combination of red and purple light waves, it could also be beneficial — in theory. However, there’s no research backing the claim at this time.
Red light
It’s thought that colors close to red on the light spectrum might stimulate melatonin production. However, at this time, more research is needed to support this theory.
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The researchers found that after 14 days, participants who received light therapy improved their sleep quality and melatonin levels significantly compared to participants not exposed to any light.
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Individual differences
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In the first experiment, participants were exposed to white light, a random color, or their self-selected preferred color. The researchers observed that participants exposed to their preferred light color fell asleep significantly quicker.
| Color | Time to fall asleep |
|---|---|
| white | 18.8 minutes |
| random nonpreferred color | 18.1 minutes |
| preferred color | 11.8 minutes |
In the second experiment, the researchers also included a group that was only exposed to darkness.
Once again, the researchers found that the group exposed to their preferred color fell asleep significantly quicker than participants in the other groups.
| Color | Time to fall asleep |
|---|---|
| white | 21.2 minutes |
| darkness | 21.1 minutes |
| random nonpreferred color | 16.8 minutes |
| preferred color | 12.3 minutes |
Babies and children seem to also be negatively impacted before bed by blue and white lights. That’s why warmer colors are often recommended for night lights.
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The researchers found that children had greater melatonin suppression than adults in both cases, but their melatonin was even more suppressed when exposed to yellow light.
Some people worry that exposing infants to bright lights at night while nursing could negatively impact their health. However, one
It’s well-documented that exposure to blue light can negatively impact your sleep quality. Electronic screens, LED lights, and fluorescent lights can all contain blue light.
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The same 2016 study found that violet light could have a similar effect as blue light. However, there’s been no research on the effect of violet light in humans.
Many factors can impact the quality of your sleep. Here are some tips to help you sleep better.
Habits to minimize:
Habits that may improve sleep:
- exposing yourself to bright light during the day
- exercising regularly
- sleeping on a comfortable mattress and pillow. Want suggestions? Browse our market, filled with editor-trusted and expert-verified pillow and mattress recommendations.
- having a quiet sleeping area
- doing something relaxing before bed
- keeping your room at a comfortable temperature
There’s some evidence that red light may induce sleepiness. However, more human research is needed to back this theory.
It’s well-documented that blue light can have a negative impact on your melatonin levels.
Exposure to green and purple light could also potentially hinder your ability to fall asleep, but more research is needed to fully understand their effects.
