08/08/2012 10:39 am ET Updated Oct 08, 2012

Blind People Often Find It Hard To Align Their Sleep-Wake Cycle With 24-Hour Day

Melanie Brunson, who has been blind since birth, suddenly awoke and found herself standing at 15th and K streets in Northwest Washington.

She had stopped at the corner on her way home from work to await a safe time to cross and had dozed off. Even on awakening, she was so groggy she couldn't focus well enough to hear passing cars and judge when it was safe to cross. The incident was a startling reminder of the sleep problems that had plagued her since birth.

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