Researchers Identify Brain Cells Responsible For Keeping Us Awake

Bright light arouses us. Bright light makes it easier to stay awake. Very bright light not only arouses us but is known to have antidepressant effects. Conversely, dark rooms can make us sleepy. It's the reason some people use masks to make sure light doesn't wake them while they sleep. Now researchers at UCLA have identified the group of neurons that mediates whether light arouses us or not...

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