There is a high possibility that your throat is not lubricated enough. All you need to do is take some water often to be able to get rid of this. If this does not go away, I would recommend that you see a doctor immediately.
Mine does the same thing, my mom said that it was because I haven't drank anything,since I was asleep,but I took pain relief medicine and every time I woke up at night I would drink water. I hope that helped.