Sleep is food for
Human beeings sleep about ...of our life.
During our life we sleep about ...
How much sleep should we get?
How much time do teens need to sleep?
Lack of sleep is ...
Lack of sleep leads to ...
What are teenagers more likely to develop if they don't sleep well?
How many days do people spend dreaming in their lifetime?
What have most people dreamt about?
How do blind people dream?
How long does it take a person to forget most of his/her dream?