why are we sleep?

why are we sleep? why we must sleep Why do we need sleep why don't we sleep? why are we always tired,do you know?firstly if we can not sleep why we are people? we why we are human Why are we always tired,do you know?Firstly if we can’t sleep 1 ,Why are we always tired,do you know?Firstly if we can’t sleep 1 ,we will be tired.But we are often too 2 .We can’t finish our work in the day and we must do it 3 night.We go to be we are very __(sleep)in spring. we are very ___(sleep)in spring. why we must sleep very early can make us better? We are often t___ it's important tp get e____ sleep,but do we know why?It's clear that less we sleep,the w___ we perform in everyday life.Have you ever felt t___ in the middle of the day,e___ after lunch?Resears have found that it may be h___ to slee Why(Are We Still Friends) 歌词 Why We Are for Gun Control Why are we going to love How many reasons are given why people might get fat without enough sleep? 这句话怎么翻译 the more we sleep.the longer we are The work our bodiles do while we are awake goes on while we sleep.