Not quite. I would revise it this way: When John woke up on the crisp morning of December 23rd, it was way too cold. He had grown rather fond of his toes and decided not to risk losing them by carelessly leaving the safety of his warm bed. There are probably a dozen or more ways to revise it; I'm sure some others will respond as well. :)

When John woke up on the crisp morning of December 23th, clearly it was way too cold and he had grown rather fond of his toes, to lose them in such a careless way as getting up from a warm safety of his bed.