If My Dreams Were Reality

How real's the real'ty,
Of the dreams when you sleep?
We already know that nothing happens,
Outside of what we see,

Of course you can't cut yourself in a dream,
And find blood when you wake,
And you could never fly in the real world,
Like in the world your sleeping body makes,

But if you slept for the rest of your life,
And only had your dreams,
With no access to the world outside you,
What does real'ty mean?

It means you're free,
To make it what you want,
No one's yet been able to say for sure,
What's really reality and what's not.