That sounds like very normal beardie behavior to me, based on my research and limited experience (I'm not quite an expert since Freddy is my first beardie but I've been dedicated to learning beardie behavior over these last 2.5 years, as it sounds like you are doing now!) From juvenile to now, Freddy has always been pretty chill in the viv like you're describing (we went through a brief glass surfing period, but that ended)... except, of course, when the food comes! But yeah, his main activity is during our short (and obviously closely monitored) play times outside the viv; that's when he'll go for a little run, try to find somewhere to hide, or jump around a little. Oh, and if you're concerned about Sushi's inactivity now...just be ready for her first clutch of eggs! And brumation! The lack of movement is amazing (and a little scary) but just remember that it's totally normal. You're doing great! Keep up the good work.