Canine Conundrum

When I sit on my bed with my computer propped on an empty flat box, my dogs lay down on the floor all around me, quiet, peaceful, still. When I sit at my desk in the den, typing away with better posture, my dogs roam around, wrestle with each other, or stand by barking, rubbing their wet noses on my elbows or my knees annoyingly. My location is the only thing I changed. Why do the dogs behave so differently?