长颈鹿因为体积大，移动不方便，所以容易受到食肉动物的攻击，因此睡眠时间不长。

Adult giraffes sleep standing up in short bursts, but keep watch on their young which lie down to sleep, tucking their long legs underneath their bodies and curling up like a cat.

成年长颈鹿站着小睡时也会照看躺下睡觉的幼崽。幼崽把长腿弯曲在身子下面，像猫一样缩成一团。

However, other animals are experts at multitasking and can swim or fly while sleeping.

还有其他一些动物擅长同时进行多项活动，边游边睡或者边飞边睡。

As well as exotic beasts, the chart features pets such as domestic cats (shown above) which sleep for approximately two thirds of their lives and take extra naps when it's raining or if they're bored

除了一些奇异的野兽，图表也突出展示了一些宠物，例如家猫，它们一生中大约三分之二的时间都在睡觉，下雨或者无聊的时候也会睡一小觉。

For example, dolphins and whales sleep while keeping half of their brain alert, so they don’t drown, with dolphins typically dozing for around 10 hours a day.

例如，海豚和鲸鱼睡觉时会保持一半大脑清醒，所以它们不会淹死，海豚通常一天会睡10个小时左右。

The method is known as ‘logging’and it has been observed in bottlenose dolphins, which keep half of their brain a low level of alertness.

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