It has been discovered that during sleep the brain releases a hormone into the blood stream that will paralyze the major muscle groups to prevent locomotion.
睡眠时，大脑会释放一种激素到血液中，这种激素麻痹主要的肌肉群，使其无法移动。
The blood-brain barrier - which stops most things in the blood stream from crossing to our brains - is much too great an obstacle.
血脑障壁更是重大障碍，它有着阻止血液中许多物质进入我们大脑的作用。
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