Did you close Safari from the background? Tap the home button twice to pull up the apps running. Press and hold Safari until it jiggles, then tap the "-" in the left-hand corner. If that doesn't work press the on/off and home buttons simultaneously until the phone powers off and you see the apple symbol.
Thanks trrlightning....I did that, but it still didn't solve the problem. I went to the Apple Store & it turned out that one of my apps was corrupted (?) so they restored it back to the factory settings and I just finished syncing it.
By the way, I did not know that all the apps I had opened recently were still "running". I thought that when you pressed the home button the app was closed. The Apple store told me that this had changed in an update but I wasn't aware. I guess if you have too many apps open it can cause the phone to lock up or start doing odd things. I will now start closing apps every night, just to eliminate future problems or kinks.