When I took my 1st dose (last Saturday) it gave me a lot of energy. 2nd day not so much and has declined all week. In fact, I am downright sleepy by the afternoon. I started taking a 2nd pill in the afternoon but that didn't help at all. I just yawn all the time! What up with that?? Anyone else have this issue? I had a ton of energy before taking this and now I am zapped.