Watch Nova season 2 episode 4 online. Most of us spend one-third of our lives in a state of which we understand remarkably littleâ€”some people sleep for only a few minutes a night, and function perfectly well, while others declare that eight hours isn’t enough. NOVA explores traditional notions about how much sleep we need; looks at effects of the sleeping pill, and, perhaps the most baffling of all aspects of sleepâ€”dreaming.
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