He was back to his normal self this morning when I got him up at 6am. Pretty much all night he would shake every time he moved. I'm thinking it was blood sugar. He didn't really eat his breakfast yesterday morning either and I'm not sure how much he ate last night, because I just left his food in his bowl from morning and gave it back to him in the evening. My vet drew some blood, but she thinks it may have been low blood sugar also, but by the time I got online to figure it out, it was already the middle of the night and he was sleeping and I didn't want to disturb him. I will try to video tape again if it happens again, but I think as long as I make sure he eats better, I think he'll be fine. You were the first person I thought of though even though I didn't think it was the same as Vegas. Thank you so much for your help.