I have experienced this, for me there were two main factors. 1) Temperature - If my bedding is too hot or too cold I found that I would wake up in the early mo

I have experienced this, for me there were two main factors. 1) Temperature - If my bedding is too hot or too cold I found that I would wake up in the early morning. I now have three duvets a Winter, Autumn/Spring and Summer. If I find myself waking up in the night I shift to one of the others, it helped a lot. 2) Fresh air - I cannot say why but having a window open even if it's just a couple mm makes a huge difference to me.