Sleep patterns often run in families, and researchers have been identifying genes that influence them.

Early to bed, early to rise — a fine plan for a dairy farmer who has to get up long before dawn to milk the cows. But if you're someone who works all day with stocks and clients and may want to enjoy an evening out now and then, it would be better not to be getting up at 2am and have to struggle to stay awake through dinner or a show.

Such is the challenge faced by a friend who has what sleep specialists

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