Many students in my class sleep only five or six hours a night.
They study late and then use their phones in bed.
Our teacher says young people need eight hours of sleep.
When we sleep , we remember new words better and we are not before a test.
Last month I tried something simple.
I turn off my phone at ten and put it on the .
I read two pages of a book .
Now I wake up at six without a , and my are better.
Sleep is free medicine, my teacher says.