I don't recommend listening to even 10 seconds of this. I did and had a terrible nightmare, seriously :(
As mentioned, I do recommend that people who are new to binaural beats stick with shorter tracks like this one: http://bit.ly/binauralbeginner
With that said, dreaming (and nightmares) are your brain's way of dealing with life's challenges and frustrations. It might not feel like it, but it's a good thing. :)
D-Sheep