It may be just knowing whether or not to do something.
It may be a sense of something that just doesn't feel right.
It may be knowing that something is 100% right...but still not something you can proceed with.
Twice in my life, I have heard people frantically calling my name in my sleep. In once case I called my friend before six-thirty in the morning. It was a life-saving call...but since I am not telling stories that aren't mine any more, if he reads this and wants to share, he can go for it. :-)
I wasn't in touch with the other friend and I sent an email via Classmates.com. Seriously. I didn't know how else to get in touch with them. Many years later I was in contact with them and they had never received that email, but, they were alive and kicking and that was all that mattered.
I have heard specific voices in my head at different times in my life. Last year I heard, "Don't worry. Everything is gonna be alright." And then the Bob Marley song came on later that day. (OF COURSE IT DID!)
Songs. A voice. A feeling. Just knowing. We all have it. We just have to figure out how to use it. The universe is listening...
So...has your intuition kicked in? Do share.