Health Report - Alcohol Abuse Costs US More than $220 Billion a Year

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After	Bowman	He	Nelson	Some	They	University	active	cause
colors	controls	dark	depressed	fourth	groups	in	investigators	little	low
of	or	send	slept	those	thoughts	water	which	white

colors that people see late at night could signs of severe depression. That was the finding a recent study that builds on earlier findings. showed that individuals who live or work in levels of light overnight can develop clinical depression, severe depression. Signs may include loss of interest pleasure in most activities, low energy levels and of death or suicideIn the recent study, American designed an experiment that exposed hamsters to different . The researchers chose hamsters because they are nocturnal, means they sleep during the day and are at night. The animals were separated into four . One group of hamsters was kept in the during the nighttime period. Another group was placed front of a blue light. A third group in front of a white light, while a was put in front of a red light. four weeks, the researchers noted how much sugary the hamsters drank. They found that the more animals drank the least amount of water. Randy heads the Department of Neuroscience at Ohio State . He says animals that slept in blue and light appeared to be the most depressed. Randy notes that photosensitive cells in the retina have to do with eyesight. He says these cells signals to the area of the brain that what has been called the natural sleep-wake cycle. says there is a lot of blue in light. This explains why the blue light and light hamsters appeared to be more depressed than seeing red. For VOA Learning English, I'm Laurel .

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