The gradual changes in the eye as we age cause it to be less effective in letting critical wavelengths of light in, and this leads to insomnia, according to researchers in Sweden.

As we age, the lens in our eye gets less and less flexible. It also becomes more and more yellow and the pupil itself begins to narrow. All this spells defeat for the photoreceptors in the retina that are especially sensitive to blue spectrum light.

This light and the photoreceptors that need it are a critical piece in communication with the brain that tells it the early part of the day means energy and activity, and the evening means relax, recharge and recuperate.

Scientists looked at participants who had cataract surgery to remove occluded lenses and replace them with new, clear ones. The occurrence of insomnia in subjects who had no vision issues was far lower in age mates who had less availability of light on the photoreceptors in the eye, leading to the conclusion that the more light the brain is able to receive through the eye, the better sleep quality they will enjoy.

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