Same here. I take Vitamin D3 supplements due to being diagnosed with low Vitamin D but when I take them, I have heart palpitations, especially at or near bed time. It is definitely the Vitamin D supplements because if I stop taking them for a couple of days, no more palpitations. Then if I take the supplements I have the palpitations that same night. However, a cardiologist has told me that the palpitations are harmless and I can ignore them. That's a little hard to do when you're lying in bed at night and your heart is skipping and thudding.