Could be the heat for sure.

I will note that Penny was SUPER CRAZY snuggly when I adopted her (around...10 months?) and was for maybe...6-10 months? As she hit maturity she was happier to have her own space. To the point where she would sleep in the other bedroom at times. She could still be my snuggle bunny but significantly less. We went from falling asleep cuddling to her being in the other room :P And I think our relationship was solid! haha

It is funny as rocky is NOT a snuggler. he doesn't often want to be touching you. BUT he has to be by my side. Near me.