Waking up with pounding heart

I've been slowly transitioning to carnivore, eating less than 50 grams of carbs now for a fee weeks while rampimg up my meat and egg imtake from high quality grass fed Ground beef and local organic eggs.

The past few nights I have slept very bad/light, waking up several times with a higher puls than normally feeling very alert. Have any of you experienced anything simular? What could the reason be? Is it some kind of histamine intolerance? Perhaps overconsumption of fat leading to more being oxidized? Or could it be from the lack of carbs?