Neurologists (神经病学家) have known for years that staring at screens late in the evening can disrupt sleep. Researchers at the Lighting Research Centre, at the Rensselaer Polytechnic Institute in New York, are warning that looking at tablet displays for more than two hours “leads to a suppression of our natural melatonin levels as the devices emit optical radiation (光辐射) at short wavelengths” - in other words, they emit bluer light.
They say: “Although turning off devices at night is the ultimate solution, it is recommended that if these devices are used at night displays are dimmed as much as possible and that the time spent on them before bed should be limited.”
They drew their conclusions after measuring melatonin levels in 13 volunteers, after they had spent time viewing iPads at full brightness at a distance of 10 inches, for two hours. Melatonin levels were significantly lower after they had done this, than they were after the volunteers had viewed their iPads for the same time, but while wearing orange glass goggles, which cut out the blue light.
They wrote in the journal Applied Ergonomics that tablet makers could “tune the spectral power distribution of self-luminous devices (自发光设备的频谱功率分布)” so that they disrupted the sleep patterns of users less.
It is not just a good night’s sleep that could be jeopardized (危害) by too much late night screen time. Researchers know that persistent disruption to sleep patterns can lead to an increased risk of obesity, and even breast cancer. However, these studies tend to be comparisons of those with chronic (慢性的) sleep disruption, such as long term shift workers, with those who have normal sleep patterns.
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