Hypnagogic happens as a result of sleep deprivation, caffeine intake or stress. It usually happens during a transition between wakefulness and sleep
Distraction.
In order to effectively listen to another person when they are speaking to you all other distractions should be eliminated so your complete focus and attention is on the person speaking and nothing else. In this case the distraction was the tv. By switching it off Bjorn has eliminated the barrier to effective listening.
The Cold War had many affects on education in the United States. One example is how schools would have air raid drills in case the Soviet Union launched a nuclear bomb, not that hiding under a desk would save you anyway. Another way is all the anti-Russian propaganda produced and distributed to young students.
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The continent known for the origin of humans is Africa