Answer:
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Who spends the day at the window, goes to the table for meals. And hides at night?
What contains zero calories, but if you consume it, you will probably gain weight?
Two people are born at the same moment, but they don't have the same birthdays. How could this be?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What is it?
I'm the source of all emotion but I'm caged in a white prison.