Dreams-what are they?

Some times they come to tease
Make us do the things
Which we yearn to do in real world
But just cant seem to do.

Some times they come to us
As if bearing some warning
For some thing bad coming
From some unknown guardian.

Who are they, what are they?
Sometimes I truly wonder
Specially when I look back
And realize their real worth.

The way they sometimes tried
To show me my sleeping pain
And sometimes they seemed to warn
About the dark days to be met.