鱼会睡觉吗？
Scientists are still studying exactly how fish "sleep". Fish don't sleep in the same way that land mammals do, but most fish do rest.
Research shows that fish can slow down their activity and metabolism while still staying alert to danger. Some fish float in one place. Some wedge themselves into a safe spot in the mud or among coral, and some even find a suitable nest. The Pacific sand lance, for example, burrows into the sand to rest, save energy and hide from predators.
These periods of rest may do the same job for fish that sleep does for people, helping their bodies recover.
鱼到底是怎么“睡觉”的，科学家至今还在研究。鱼不像陆地上的哺乳动物那样睡觉，但大多数鱼确实会休息。
研究表明，鱼可以降低活动量和新陈代谢，同时仍然对危险保持警觉。有的鱼会浮在原地不动，有的会钻进泥里或珊瑚丛中某个安全的地方，有的甚至会找一个合适的窝。比如太平洋玉筋鱼，就会钻进沙子里休息，既能节省体力，又能躲避天敌。
这样的休息，对鱼来说可能和睡眠对人的作用一样，能帮助身体恢复。