When you wake up the key it to accept it, you have to think ok right now my body needs to be awake. And that's ok.
Get up have a drink, cup of tea, herbal tea. Open a book, watch something on tv, put you bedside light on, write in your diary, do some emails, even go for a shower, just use the time you have for maybe a hour.
Then go back to bed and rest and sleep, if you lie in bed "thinking" about being asleep and fighting being awake it will just get worse and worse.
And the next night you will go to be and fear waking up again, so will no doubt wake and the cycle continues.
The key is to remove the fear of waking up! Just see it as bonus thinking time.
And also HRT, and other supplements for this period of your life, but the above method will change your whole life attitude to waking and acceptance.
I wake lots at different times in my cycle, around ovulation, so you could keep a diary, and write down your dates and worries nightly as well.
I enjoy my little secret night wake ups, I feel happy to be alive, awake, safe and try and stop that "oh shit I have a busy day, I don't need this thoughts"