Stevia as a stimulant?

[youngshinzen]

Ive noticed that stevia (in liquid form as steviaglycoside, no other sweeteners added) and as a sweetener (with xylit) in protein shakes gives me instant high energy and after two days of regular consumption it lead to sleeplessness and increased pulse.

After not using it for a few days it normalised and I just sweetened some yoghurt with the liquid stevia. I can feel the effect instantly. Couldn’t find any info on the net about that side effect. Any experiences?