It is quite normal to wake in the night. In the past sleeping in two spells was quite normal.
Assuming you are merely waking, not worrying or with a yammering mind, I have found the best thing to do is find something to do that will lull you gently back to sleep.
For me, to begin with, it was Classic FM, turned down until I could barely hear it. Now it is my Kindle, with the screen turned down to grey with high warmth, which means it is easy on the eye and then a selection of easy reading books that I have read many times.
It has reached a stage now, where almost as soon as I pull the Kindle out from under my pillow, my eyes start to close.