You wouldn't have low blood Sugar during the night if you felt you have more energy. You'd feel weak.
If you think you have any kind of blood Sugar problem, be sure to get a glucose monitor to make sure. I thought I had horrible hypoglycemia for years, but turned out I was misdiagnosed and I healed those symptoms after days of going on a juice fast.
About your stress, the best easy self-help technique I've come across is FasterEFT.