Why do we sleep? How much sleep do we really need? What causes sleep disorder--and what can be done about them? We have all puzzled over--or been plagued by--the mysteries of sleep. Now a leading researcher provides an engaging and informative introduction that answers many of our most baffling questions.
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What's an Audio Format Audio format refers to the way an audiobook is recorded. Not all audiobooks have the same formats. Classic Audio: A human reading an audiobook without the text displayed. VOICEtext (H): Human narrator with text that you can follow along with as it reads. VOICEtext (S): Synthetic voice with text you can follow along with as it reads.
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