Becoming emergency foster parents

I have been asked if I'm open to being emergency foster parents. The only thing they told me was that I could get calls at all hours. I'm fine with that and I do realize that these may be kids with no known history and very little information. I guess I'm wondering if there are other emergency foster parents out there and what their experiences have been like. And how different is it from regular foster parenting? Any advice you can give me would be appreciated, pros and cons, etc. Thanks!