Hibernation is more than sleep. It is a very deep sleep.The animal's temperature drops to just over zero centigrade, and its heart beats very slowly.People who find hibernating animals asleep often think that they are dead: the body feels very cold, and the creature may breathe only once every five minutes.A hibernating animal cannot feel any pain.You can touch it, or even pull its tail, without causing it to move or wake up.In its hibernating state it can even live in a poisonous atmosphere for a long time without any ill effect.

冬眠不僅僅是睡眠，而是一種沉睡。動物的體溫降到剛好在零攝氏度以上，心臟跳動非常緩慢。人們看到處于冬眠狀態(tài)的動物，常常以為它們是死的：身體摸上去冰涼，可能每5分鐘才呼吸一次。冬眠的動物感覺不到任何疼痛。你可以摸它，拉它的尾巴，也不能使它動一動或醒過來。當它處于冬眠狀態(tài)時，甚至可以長時間地生活在有毒空氣中而無任何不良后果。

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