Depends how much: Most people will have a little bit of this occasionally. Some people are even more perceptively sensitive. It is as if the peripheral vision is hyperactive. We all have these vigilance brain functions on automatically. Insomnia, isolation, substance abuse and brain illnesses each can increase this brain "hyper"- activity. If it continues or bothers you, see a doctor to evaluate it.
Answered 11/14/2012
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A doctor has provided 1 answer
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