Sleepy baby during Ultrasound.

Hey guys, I wanted to know if anyone else has experienced this. So I’m 34w and 6d, I just had a growth ultrasound today. Baby girl is 6.9lbs and measuring 2w ahead! No matter what time of day it is, when I have an ultrasound she’s always sleeping and refuses to wake up and move. She’s also always got her hands in front of her face. After the ultrasound she’ll go back to being active. Is anyone else’s Little one stubborn when it comes to ultrasounds? I mean she was so active earlier today then went right to sleep when the ultrasound started.