这里用to...是因为要和前面的to do anything对应,也就是说是省略了一个want, 应该是want to sleep
关于第二个to要不要省略的问题,我觉得可以省略.下面的句子都是我从初中教材（有几句是高中教材的）等很可靠的地方找来的,都有有关省不省略的,当然不只是to了,还有其他词；
其中有的句子省略了一些重复的地方,有的没省,说明省不省都可以.除非有一些特殊情况.这个我还在研究中.
如下：
Talk about the different attitudes in Colombia and Switzerland.
We usually plan to do something interesting, or go somewhere together.
Read the following opinions of a Colombian and a Swiss student and fill in the chart.
Sometimes we might even need to spend some time leading in to a question or request.
You can learn all about the history of computers, as well as learn about science.
Mom wants me to get up at 6:00 and play ping-pong with her.
Are they Sandra’s or Tom’s?
Put the photos and the letters on the board. Put them in different places. The other students will match the photos with letters.
A salesperson can be either a man or woman.
I don’t have a sister or brother.
Can you go by ship or train?
Plan a schedule to balance the time needed for your schoolwork and your hobbies.
With a partner, discuss the time you spend on schoolwork and on hobbies.
Our teachers believe that if we did that, we would concentrate more on our clothes than our studies.
Read the conversation. Then write Sun Fei’s and Wu Yu’s rules in the chart. Use “Don’t” and “You can”.
You are going to hear a personal opinion on why women are not given the same chances in their careers as men.
It was still not too late for me to improve my studies, prepare for the university entrance examinations, and …
That was a generation when girls’ education was always placed second to boys’.
Do you think it is important to study chimps in the wild rather than in a zoo?
… and showing that women can live in
the forest as man can.
We realize that the bond between members of a chimp family is as strong as in a human family.
I do want to change this situation, but I don’t know how.
I like to sing and dance.
She likes to play with her friend and eat grass.
I like going to the movies with my friends and playing sports.
Don’t listen to music in the classrooms or the hallways.
Listen to music in the classrooms or hallways.
Some festivals are held to honour the dead or to satisfy the ancestors, who might return either to help or to do harm.
For the Japanese festival Obon, people should go to clean graves and light incense in memory of their ancestors.
The most energetic and important festivals are the ones that look forward to the end of winter and to the coming of spring.