Hi Trinity! No, you're not overreacting at all. We know our cats and when things aren't quite right we pick it up right away. If your kitty just isn't himself then definitely err on the side of caution and call the vet. Hopefully there's nothing to worry about, maybe kitty is just tired from doing kitty things during the night. But if your fuzzy buddy is sick, better to deal with it in the early stages and avoid bigger problems later on. What I see here is a responsible, caring pet owner doing the right thing. Please let us know what happens? My prayers are with kitty.....