Other illnesses including heart disease, Alzheimer's disease and hormonal problems can also disturb the normal pattern of sleep.

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Dr. Amy Evans, a pediatrician and medical director of the Center for Breastfeeding Medicine in Fresno, California, says that as many as 5% of all women have underlying medical conditions that prevent or seriously hinder lactation: hypoplasia, thyroid problems, hormonal imbalances and insufficient glandular tissue, among others.

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In addition, as far as the prenatal environment per hormonal influences, there is some evidence that sexual, physical or verbal abuse could be factors rising to the level of stress that might alter the hormonal prenatal environment, leading to problems in neurodevelopment.

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Twenty-seven percent of women and 34 percent of men in the survey said serious health problems such as cancer are likely to result from using the pill or other hormonal contraceptives.

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