How long do cats sleep? they sleep about 16 hours a day. ……

Dolphins sleep with one eye open! ……

Dolphins sleep with one eye open! ……

Less sleep means more dreams. ……

Like people and animals, plants also need sleep. Sunflowers sleep a lot. They always wake up at 10 am. ……

Sleep on itA: I really don't know what to do.B: It won't look so bad tomorrow. Sleep on it. Sleep on it: 明天再说；考虑一两天再说。 ……

高考链接高考词汇account for 占. （百分比）Girls account for about 50 per cent of the class. efficient adj. ……

them? Recently, "Life In The Undergrowth", a BBC TV programme, shared some secrets:1. Insects were... that of all the humans on Earth.6. Ants never go to sleep. 7.Dragonflies(蜻蜓) are the fastest insect ……

their own grocery list secrets. I can offer no proof, however, and my suspicions certainly don't justify my behaviour. But they do enable me to sleep a little better at night ……

. Now you can learn the secrets of olive oil that have made it such a favourite kitchen cupboard... of olive oil before bed, put on cotton gloves, and go to sleep. Your hands will be softer and smoother ……

信不信由你
How long do lions sleep? About 20 hours a day! ……

信不信由你
Do elephants and horses go to bed? No. They sleep standing up. ……

1. I sleep at 9:00 pm most evenings. 2. I go to sleep at 9:00 pm most evenings.英文中，动词sleep表示睡觉的整个过程。如果表达“上床睡觉”的动作，要用go to sleep。 ……

Fish don't have eyelids (眼皮). When they sleep, they keep their eyes open. ……

Your brain (脑) is still active (活跃的) when you sleep. ……