Lazy Baby at 20 Week US

I went in for my 20 week US yesterday and the tech was like "your baby is sooo lazy". She tried poking the baby with the US probe but I guess that didn't do much. His heart rate is fine and he is the appropriate weight but he just didn't want to move. The tech asked if I had eaten before the US. I had a small apple on my way there and lunch maybe 4 hours before that. The US tech suggested I come back next week and come in on a full stomach. I've been reading around and some people suggest orange juice, chocolates, and ice cream. Anyone have any suggestions or have gone through the same issue?