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Heterosexuality

Heterosexuality is romantic and/or sexual attraction or behavior between members of the opposite sex or gender. As a sexual orientation, heterosexuality refers to an enduring pattern of or disposition to experience sexual, affection, physical or romantic attractions to persons of the opposite sex; it also refers to an individual’s sense of personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them. The term is usually applied to human beings, but it is also observed in all mammals. The demographics of sexual orientation are difficult to establish due to a lack of reliable data. However, the history of human sexuality shows that attitudes and behavior have varied across cultures.

Sleep

Think of everything people do during the day. Try to guess which activity is so important that people should devote one-third of every day doing it. The first things that come to mind are probably: working, spending time with family or pursuing leisure activities. However, there is something else people should be doing about one-third of the time--sleeping.
Many people view sleep as merely a "down time" when the brain shuts off and the body rests. In a rush to meet work, school, family or household responsibilities, people cut back on sleep, thinking it will not be a problem, because all of these other activities seem much more important. However, research reveals that a number of vital tasks carried out during sleep help to maintain good health and enable people to function at the highest levels.
While people sleep, the brain is hard at work forming the pathways necessary for learning and creating memories and new insights. Without enough sleep, people cannot focus and pay attention or respond quickly. A lack of sleep may even cause mood problems. In addi­tion, growing evidence shows that a chronic lack of sleep increases the risk for developing obesity, diabetes, cardiovascular disease and infections.
Despite the mounting support for the notion that adequate sleep, like adequate nutrition and physical activity, is vital to well­being, people are sleeping less. The nonstop "24/7" nature of the world today encourages longer or nighttime work hours and offers continual access to entertainment and other activities. To keep up, people cut back on sleep. A common myth is that people can learn to get by on little sleep (such as less than six hours a night) with no adverse consequences. Research suggests, however, that adults need at least seven or eight hours of sleep each night to feel rested. Indeed, in 1910, most people slept nine hours a night. But recent surveys show the average adult now sleeps less than seven hours a night and more than one-third of adults report daytime sleepiness so severe that it interferes with work and social functioning at least a few days each month. As many as 70 million Americans may be affected by chron­ic sleep loss or sleep disorders, at an annual cost of $16 billion in health care expenses and $50 billion in lost productivity.
What happens when people do not get enough sleep? Can people make up for lost sleep during the week by sleeping more on the weekends? How does sleep change as people become older? Is snoring a problem? Do people suffer from sleep disorders? Read on to find the answers to these questions and to better understand what sleep is and why it is so necessary. Learn about common sleep myths and practical tips for getting adequate sleep, coping with jet lag and nighttime shift work and avoiding dangerous drowsy driving. Many common sleep disorders go unrecognized and doctors cannot treat them.