For the last several months, we've been giving Whitey amitriptyline. It's an antianxiety drug used to help cats with interstitial cystitis. (Suggested by our vet after we ruled out infection, blockage, and similar urinary tract issues.) It works great for that purpose, but the side effect is lethargy. All cats sleep a lot, and Whitey's always been less active than his brother, but lately he's been sleeping pretty much all the time.
So, after several months with no signs of anxiety, we've taken him off the medication. And it was like flipping a switch. He started the morning (earlier than usual) by chasing his tail around the bedroom cat tower, he's been chasing his brother, and right now he's rocketing around the upstairs hall in pursuit of turboballs during what's usually prime nap time.
It's good to have our Spider Kitten back. Here's hoping his other symptoms stay gone.