Blue light increases alertness and regulates our internal body clock. This artificial light activates photoreceptors known as intrinsically photosensitive retinal ganglion cells ipRGCs, which suppresses melatonin.
The blue light emitted from digital devices could contribute to the high prevalence of sleep dysfunction, it contributes to decrease in sleep quality.
Study participants wore short wavelength-blocking glasses three hours before bedtime for two weeks, while still performing their nightly digital routine.
Results showed that some of the participants melatonin levels increase. Melatonin is a chemical that gives body signals to sleep.
Wearing activity and sleep monitors 24 hours a day increases sleep duration.
The largest source of blue light is sunlight, it's also found in most LED-based devices like computers, mobile phones and television.
Limiting screen time, applying screen filters, wearing computer glasses that block blue light, or using anti-reflective lenses to reduce the effects of artificial light at nighttime can prevent the effects of blue light.
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