I'm sure it's because he's in shed, but Mr Slithersworth isn't all that active. I'm not sure how active BPs usually are, but I thought 'wouldn't it be neat if a 'snake alarm' could alert you to activity?' Well, I found this doo-dad on the Home Depot site:
White PAR Light Motion Sensor Adapter
Unfortunately, it doesn't look like a direct link will work, so go to homedepot.com and run a search on that item.
Basically, it's a motion sensor hooked to a light socket. I figure one could run it to a light in the living room or something so that you can be alerted to the fact that your snake is out and about. Think I could be onto something, or am I just crazy? I may stop by there today and pick one up.