Anybody need help putting your kids to bed?

My sister visits often. She loves my kids and cant get enough of them. I on the other hand wake up around 7 am and at about 9:30 have had enough of them. The best part is when she is here they fall asleep so fast and don't get out of bed once. Most nights they ask for a drink of water several times. They get up to go to the bathroom 3 times and Olivia can always be found playing with their little kitchen at all hours of the night. But for some reason they are exhausted when she is here. Check out the video clips and see if you can figure out why. The funniest part is that Annette is just as tired. Her head hits the pillow and within seconds she is gone.