At first glance the sentence above seems preposterous. However, with a bit of explaining, it will make more sense. Personally, I feel this is a huge breakthrough for explaining many things, including the rising rates of obesity, depression, diabetes, and breast cancer in the Western world.
When we were evolving, we experienced about 12-14 hours of darkness every 24 hours. We did not have lights or TV’s or computers to occupy our time at night. In the modern world, this is exactly what is going on. Most of us spend our night time hours surrounded by light. Our homes are lit up with TV’s, computers, cell phones and other gadgets. City lights from outside our homes also reach our eyes. What is the effect of all this “unnatural” light at night on our bodies?
According to doctors and researchers, all this light interferes with our body’s natural rhythms (called circadian rhythms). Enter melatonin. Melatonin is an important hormone that has been proven to be protective against cancer. Our pineal gland produces melatonin, but only when it is dark. Completely dark. Light will stop the production of melatonin – even a little bit of light. The reason this is so important is because melatonin is what makes us sleepy. It enables us to sleep soundly and deeply. The way it should theoretically work is when the sun sets, the body begins to produce the melatonin. After an hour or so we begin to become sleepy and eventually fall asleep at a decent hour – say 9pm. We would sleep soundly and only be awakened by the sun coming up.
But what is happening in present day society is far different. Many of us actually ratchet up the light around us as night falls. At this point I need to explain I am speaking about a particular light called blue light. Blue light is picked up readily by a photoreceptor in our eye that has nothing to do with vision. Blue light penetrates this photoreceptor more than green or red lights. Thus, blue light is very powerful at regulating melatonin and our circadian rhythms.
This blue light is emitted from our computers, TV’s, light bulbs, iPads and other gadgets. Researchers are warning us that as we stare into these things at night, our melatonin is suppressed and our bodily rhythms are disrupted. Our bodies are confused as to whether it is day or night. Which hormones to secrete or shut down? This creates havoc in the body and been directly related to insomnia, depression, obesity, cardiovascular disease and of course cancer. Because blue light at night can disrupt our hormones, studies are showing that breast cancer in particular, to be related. In primitive countries where they do not have all this blue light at night, the incidence of breast cancer is much less. And as countries “westernize” their rates of breast cancer increase.
When researchers want to study the effect of disrupted body rhythms and melatonin, they look at shift workers. Shift workers, such as nurses, have been shown to have higher incidences of many health problems including depression, diabetes, cardiovascular disease and breast cancer. A study by Dr. Eva Schernhammer, an epidemiologist at Harvard, found nurses who have worked the night shift for 15-30 years had higher risks of breast and colon cancer. “People who work at night will always have lower levels of melatonin than the normal population (who are not exposed to light all night)”.
In fact, the World Health Organization in 2007 classified shift work as a risk factor for breast cancer. And in 2009, the Danish government began compensating female shift workers who have breast cancer.
So now that we are aware of the implications of blue light at night, what are some of the things we can do to protect ourselves?
- Use full spectrum bulbs in your house and office during the day. Because remember this VERY important point: blue light is not dangerous! It just signals your body to be awake. You want to have that during the day but not at night where it disrupts your body’s rhythms. (In fact, studies show we are not having enough bright light around us during the day when we need it and too much at night when we don’t.)
- Turn off computers and electronic gadgets once the sun sets, and avoid watching TV late at night. You especially do NOT want to fall asleep in front of the TV all night long! Some remotes have timers on them so you can program the TV to turn off by a certain time.
- Use “low blue lights” in areas where you spend most of your time in late evening, such as your living room, bedroom and bathroom.
- If you have to get up to go to the bathroom in the night, make sure your path is clear and resist turning on the light for even a few moments. That short of time is enough to stop all melatonin production and disrupt things.
- Sleep in TOTAL darkness. This means no night lights, no clock radio or cell phone glowing on the bedside table and use blackout shades and drapes if ANY light from outside is coming through your window. Many experts say you should not be able to see your hand in front of your face.
- Sleep when it is dark outside and get up when the sun comes up. At the very least try and be asleep by 10pm and be up by 6 am.
- Avoid working the night shift. This one cannot be stressed enough. Experts strongly suggest you trying to switch your hours if you are currently working at night. At the very least try not to keep the shift longer than a month or two to give your body time to readjust in between. Perhaps give your supervisor this article to read!
- If you have to do shift work, when you come home to sleep, make your bedroom as dark as possible by using black out shades. Use all the tips above to simulate night so you will produce melatonin. Also try wearing eye pads to shut out the last bit of light.
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