Well, blue light is everywhere around … As a result, you’ll end up missing out on REM sleep, which increases during the second half of the night.

Blue light irradiation also has a significant inhibitory effect on corneal stromal cell activity, which is also dependent on dose and time. Blue light has a very negative impact on the nervous system and you don’t get to have a sound sleep at night. Blue light has a specific way of disrupting our sleep cycles. Now, you might be thinking that where exactly does this blue light come from and what can be done in order to protect the eyes. The circadian photoreceptor system shows peak sensitivity to ~450–480 nm light within the blue portion of the spectrum (Brainard et al., 2001; Thapan et al., 2001), which accounts for the high efficacy of blue light to suppress melatonin and increase alertness (Cajochen et al., 2005). Heart disease: Too much blue light disrupts your sleep, and too little sleep increases your chance of developing heart disease.

However, blue light's effects on the cornea are not limited to corneal epithelial cells.

Our circadian rhythm depends on detecting how much light and darkness there is through our eyes, which then signals our body when it is time for bed. Blue light in smartphones and tablets. While some people choose to wear blue-light-blocking glasses only in the hours before bedtime, others prefer a pair, like this one from J+S, that they can wear all day long, especially if they find themselves staring at screens for most of the day. If you are watching television, reading an ebook on your tablet, or checking social media on your phone, the blue light makes it difficult for you to fall asleep and experience a full night’s of sleep. Blue light is also linked to obesity and metabolic disorders, which are both significant risk factors for cardiovascular disease. Contrary to common belief, blue light may not be as disruptive to our sleep patterns as originally thought -- according to scientists.

In an evening, the blue light that emits from devices (including TVs) suppresses the natural production of melatonin – the hormone you need to feel sleepy – and plays havoc with your body’s circadian rhythms making it harder to fall asleep and stay asleep. They come in a variety of colors and frame shapes, all of which have clear frames, so they look like traditional glasses or readers. However, blue light acts as artificial light, which ends up confusing our body’s internal clock rhythm.

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