I've seen a real pattern with all my snakes, of every species or age. If they are well fed and warm, they tend to exercise little and stay concealed.
If I exercise them regularly, they tend to be more active. It's uncanny how often I've noticed that after I put them back in their "room", they are more active and explore for awhile after exercising. If I had not exercised them that night, they don't move much.
Like us, they get bored. The same surroundings! Same food!! Every now and then, feed them a bird, egg, lizard, bat or other, non-standard food. And exercise often. Let them climb on plants, explore the closet (supervised) or the couch. The more you take them out, the more active they will be.