Blue light boosts alertness. It may suppress production of the 'sleep hormone' melatonin. It turns out that special photoreceptor cells in the eye respond sensitively to blue light and influence the body’s circadian rhythms.
Computers, tablets, phones, TVs — surely the hours spent staring at these screens are somehow affecting our eyesight. But where's the science, and can "computer glasses" really help? DW asked an expert.
Some people claim they only need four to five hours of sleep a night. After that, these super-humans say, they wake up nice and refreshed, ready for the challenges of a new day! From a health standpoint, that's bogus.
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