My cat usually doesn't touch his water (I think he drinks from puddles etc outside) but recently he's drinking loads. Every day his water bowl is completely empty. He literally never touched it before! He's also been sleeping quite a lot but that's not necessarily unusual as he will go through lazy phases.
His behaviour is otherwise normal. Still waking me up at 3am when he gets stuck on top of the wardrobe. Still going outside, still eating.
Can this be a sign of anything? Should I take him to the vets or am I being overcautious?
Thank you.