the problem with using my cell as an alarm clock

Yesterday morning I woke up halfway through a phone call with some random woman. As far as I can make out, it was just a wrong number, but because I was giving her extremely vague replies, it lasted a lot longer than it should have. I was still half asleep when the call ended, and so when I woke up later I was hopeful that I had dreamt it. No such luck: that morning, there was an incoming call from a number I don't recognize that lasted 0m 49s. I really want to call her back, apologize, and ask her what on earth I said.