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"Evolutionary success ... is going to absolutely require mobility on, at a minimum, an interplanetary scale. We either go or we die out."
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![]() There are several purposes to sleeping or lying in null-gravity, or something like it. The most important is that, since you aren't touching anything, you are unlikely to be disturbed by outside sensations.
In the novel, the person who uses it has projected his awareness into cyberspace; he wants to reduce outside stimulation to a minimum.
In the 1950's, psychologists developed a very specialized device called a sensory deprivation or isolation tank to try to answer questions about what the brain did without stimulation. What Dr. John Lilly found was startling:
Is it really easier to sleep in free-fall? According to a study conducted on two flights in 1998, five astronauts stopped snoring almost completely. They also experienced fewer episodes of sleep apnea (temporarily cessation of breathing) and hypopnea (shallow breathing, both of which cause disturbance to sleep. See Sleep Better in Space.
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Science Fiction
Timeline
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