Cancer, heart disease, type-2 diabetes, infections and obesity have all been linked to reduced sleep. The body clock drives huge changes in the human body. It alters alertness, mood, physical strength and even the risk of a heart attack in a daily rhythm. It stems from our evolutionary past when we were active in the day and resting at night. However modern life and 24-hour society mean many people are now living against their body clocks with damaging consequences for health and wellbeing. People are getting between one and two hours less sleep a night than 60 years ago. We are the supremely arrogant species; we feel we can abandon four billion years of evolution and ignore the fact that we have evolved under a light-dark cycle. Long-term acting against the clock can lead to serious health problems. This is an issue affecting the whole of society, not just shift workers. Emerging evidence suggests modern technology is now keeping us up later into the night and cutting sleep. Light is the most powerful synchroniser of your internal biological clock. Energy efficient light bulbs as well as smartphones, tablets and computers have high levels of light in the blue end of the spectrum which is right in the sweet spot for disrupting the body clock. Light exposure, especially short wavelength blue-ish light in the evening, will reset our circadian rhythms to a later hour, postponing the release of the sleep-promoting hormone melatonin and making it more difficult for us to get up in the morning. Its a big concern that were being exposed to much more light, sleeping less and, as a consequence, may suffer from many chronic diseases.
Posted on: Tue, 13 May 2014 06:22:06 +0000
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