Why Do You Cry?

A little boy and his mother were talking one day.
The little boy was having a great time.Asking all sorts of question.
When out of the blue the boy did ask.Why do you cry at night?
Is it because I am mad? See if it is because you are sad?
Is it because you miss Dad?
Oh, why do you cry?
Is it because you are cold or is it because I'm coming old?
Is it because you are lonely?
So mom why do you cry