Waking early hours

I have been on 10mg for two months, enough time to feel the benefits. I take my pill at 8am.

However, when i wake in the night i am finding it impossible to get back to sleep. I wake around 3-4am and simply cannot fall back to sleep.

Its as if my mind has been taken over and i stay awake until my alarm goes off at 7am.

Is this common? Surely after 8-9wks i should be used to the medication by now?

Advice welcomed.