魚會睡覺嗎？
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.
魚到底是怎麼「睡覺」的，科學家到現在還在研究。魚不像陸地上的哺乳動物那樣睡覺，但大部分的魚確實會休息。
研究顯示，魚可以降低活動量和新陳代謝，同時仍然對危險保持警覺。有的魚會浮在原地不動，有的會鑽進泥巴裡或珊瑚叢中某個安全的地方，有的甚至會找一個合適的窩。例如太平洋玉筋魚，就會鑽進沙子裡休息，既能節省體力，又能躲避天敵。
這樣的休息，對魚來說可能和睡眠對人的作用一樣，能幫助身體恢復。