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    Some colors that people see late at night could cause    (1)    of the condition mental health experts call clinical depression. That was the finding of a study that builds on earlier study findings. They show that    (2)    who live or work in low levels of light overnight can develop clinical depression.

    Doctors use the words clinical depression to describe severe form of depression. Signs may include loss of interest or pleasure in most activities, low energy levels and    (3)    of death or suicide.

    In the new study, American investigators designed an experiment that    (4)    hamsters to different colors. The researchers    (5)    hamsters because they are nocturnal, which means they sleep during the day and are active at night.

    The animals    (6)    4 groups. One group of hamsters was kept in the dark during their nighttime period. Another group was placed in foldable blue light, a third group slept in foldable white light. While a fourth was put in foldable red light.

    After four weeks, the researchers noted how much sugary water the hamsters drank. They found that the more depressed animals drank the least amount of water.

    Randy Nelson heads the Department of Neuroscience at Ohio State University. He says animals that slept in blue and white light    (7)    the most depressed.

    "What we saw is these animals didn't show any    (8)    at all but they did have mucked up circadian clock genes and they did show depressive phenotypes whereas if they were in the dim red light, they did not."

    Randy Nelson notes that    (9)    in the retina, have little to do with eyesight. He says these cells send signals to the area of the brain that controls what has been called the natural sleep-wake cycle.

    He says there's a lot of blue in white light, this explains why the blue light and white light hamsters appear to be more depressed than the hamsters see red light or darkness.

    Mr Nelson has suggestions for people who work late at night, or those who like to    (10)    .

    "My recommendation is if you are just living a typical mostly active [life] during the day, mostly inactive at night, you want to limit exposure to TVs which are quite bluish in the light they give off and computer screens and things like that. You can get filtered glass, you can get filters on your computer screen and filters on your eReaders to put it more in the reddish light."


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