![]() The study also suggests that blue light’s effect on sleep may be driven by other eye cells in addition to ipRGCs, she says. In young people with no particular health or sleep problems, like those participating in the study, sleep pressure may simply have overpowered the effects of blue light, says Blume. The interplay of these factors also has an effect. The need to sleep at a certain time is largely based on two components: the pressure to go to sleep, which builds during the day, and the circadian clock, which is the body’s internal clock that regulates when we need to sleep and wake up on a 24-hour cycle. Getting a little more sunlight is a simple health win for everyone An electroencephalogram (EEG) machine was used to measure brain activity while the participants slumbered. However, one was made up of a high proportion of blue light, which would be picked up by the specialised retinal ganglion cells, whereas the other had a far lower proportion of blue light and so wouldn’t be picked up by these cells. The two different lights would have looked nearly identical to the participants. ![]() About a week later, the participants had a night when they were exposed to a different light condition. The participants’ average bedtime was 11pm. On one of the nights they spent in the lab, the participants were exposed to one type of light from a screen for an hour, ending 50 minutes before they typically went to sleep. ![]() The participants, with an average age of 23, all had healthy sleep histories. The researchers tested 29 people in a sleep lab with exposure to two types of light. ![]() These eye cells, alongside cones and rods, are activated by light, but ipRGCs are particularly sensitive to blue light and are thought to play a major role in setting the body’s internal circadian rhythms, says Blume. The key to deeper sleep might be a high-protein diet ![]()
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