My corn almost never seems to seek out warmth after a meal. I leave him to it; he knows what he wants and he has never had any trouble digesting his food. My python will on occasion sit in his warm hide after food, but to be honest I think that's just because it's the first hide he comes across upon being returned to his viv. I wouldn't worry about it, the option is there and the snakes are best left to choose for themselves.