my little Emy has started to do that for the past 2 days....I just got her two weeks ago, she has been to the vet, as a matter of fact we went on Wednesday for her 3rd booster shot, then on Thursday, she threw up clear stuff, still eating drinking pooping and playing just as usual. Last night around 2:30 am she woke me up and I took her to kitchen and she peed, pooped and then through up a yellowish bile also. Then she went over to her food and started to eat, then she wanted to play at 2:30 am! I put her back to bed, then this morning when I got her up, she is absolutely normal, went for a walk, pooped again and drank water and played. So I'm wondering if the shot she had on Wednesday might have contributed to her upset tummy. I did notice she had the hiccups in the middle of the night..the night before.