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The effect of light orientation on the direction of plant growth-aka phototropism

This article talked about an experiment where scientists exposed mice to UV light equivalent to a fair skinned person soaking up 30 minutes of sunlight. Even though mice are known to be furry creatures of the night; after a week of exposure to UV light the mice began to produce the "feel-good" hormone opiod-Beta- endorphin, and the mice also began to act like addicts. So, the next step of the experiment was to take away the UV light exposure. When the scientists did so, the mice began to show common signs of withdrawal (shaky hands/paws, chattering teeth etc.). From such data scientists concluded that UV rays did have some sort of addictive affect on the mice. The author then concluded this article by wondering if the same effect can be found in humans.

The bright light emission from smartphones or tablets can affect melatonin, the hormone that controls the body's sleep-wake cycles. A Mayo Clinic study tested with different brightness levels and distances the devices must be to least affect melatonin levels in the body. Results revealed that low brightness levels along with the device held 1 foot away from the face disrupts sleep the least.