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. ……

Dolphins sleep with one eye open! ……

A snail can sleep for three years. ……

Sleep, sleep, beauty bright,Dreaming in the joys of night;Sleep, sleep; in thy (你的) sleepLittle sorrows (忧伤) sit and weep.By William Blake (English poet, 1757-1827) ……

Dolphins (海豚) sleep with one eye open. ……

Snails can sleep for 3 years without eating. ……

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

According to a recent report released by the Chinese Sleep Research Society, students in China are getting more sleep.  Here are some sleep improvements. Let’s take a look.According ……

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。 ……

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。 ……