Hi JoannFran,
I am beginning to think it is a bout of Silent Reflux brought on by my lovely hormones. I had exactly the same as you last night. Woke twice by a really irritating tickle at the base of my throat and when I coughed it felt really irritated and difficult to clear.
My diet has always been pretty good but I am now on a real mission to stop or reduce anything that can cause acid or silent reflux, which appears to be anything nice and enjoyable

I halved my patch a few weeks ago as I was getting signs of too much oestrogen (palpitations, jitters, anxiety). They have gone now but I seem to have swapped them for something else. Getting the balance right is so tricky.
I am also tryng Nexium and Gaviscon (at diff times of day) for next week or so to see if it settles, if not, back to GP.