The human being spends close to a third of his or her life asleep. This program explains why: what sleep is, what happens during it, and why it is so indispensable. The program shows what happens in the brain during sleep, explains the different kinds of sleep and dreaming, and covers tiredness, sleep, sleep disturbances, and sleeping pills. (28 minutes)

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Part of the Series : The Human Body

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		The Brain This program begins by looking at the smallest unit of the brain, the nerve cell, explaining the relationship between these cells and such functions as seeing, hearing, and speaking. It shows how the cells are units that develop and change as they fo...(more details)		DVD $99.95
		The Autonomic Nervous System This program looks at the mechanisms that control, regulate, and coordinate the functions of glands and organs: the heart and blood vessels, the lungs and respiration, digestion, the regulation of body temperature, and a host of other unconscious but...(more details)		DVD $99.95
		The Immune System This program describes the nature and function of the healthy immune system, the system that enables the body to defend itself against infections and parasites. The program also shows how the immune system can kill, when the body rejects an organ tra...(more details)		DVD $99.95
		The Biological Preconditions of Learning How does the human brain store its ever-increasing accumulation of information? Is there a limit to the faculty of the human brain, or can the learning process be increased indefinitely? The senses, the nervous system, and the brain are the biologic...(more details)		DVD $99.95
		The Biological Basis of Thinking How do humans respond to stimuli perceived by means of the senses? More concretely, what happens between a plate of food and the thought that the food is hot, or tasty, or reminiscent of some childhood event? This program looks at the neural and chem...(more details)		DVD $99.95

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