这样睡觉,你绝对想不到它们一边行进一边睡觉黑羽燕在空中飞行时于半睡半醒的状态。它们在不休息的情况下能够连续飞行两年。鲨鱼在游动时睡觉,如果它们停止游动,就会立刻沉入海底。时刻准备逃跑的睡眠者火烈鸟睡觉时把自己的头藏在羽毛下面,而且它们睡觉时总是单腿站立,时刻准备起飞。狒狒睡觉时,坐在—根不固定的树枝上,只要树枝一晃动,它们就会被惊醒。 This sleep, you absolutely can not think of them while they go to bed while sleeping in the air, black feather Yan half-asleep state. They can fly for two consecutive years without a break. Sharks sleep while swimming, and if they stop swimming they sink into the sea immediately. The sleepers, who are ready to flee, hide their heads under feathers as they sleep, and they always stand on one leg when they sleep, ready to take off. When baboons sleep, they sit on a fixed branch of the tree, and they will be awakened as soon as the branches shake.