Spike has been very lethargic lately and has been basking 24/7. it is nowhere NEAR brumation time and he is just sleeping sleeping sleeping. his appetite has decreased and i took him for a phisycal at the vet and they said he looked fine. I am worried, any ideas? btw, i have NO IDEA how old he is, i rescued him from a pet store 2 years ago and he was the same size he is now.