Wel, when Jake was back at home, still freezing, & the woman stated "thats because you still have hypothermia". Now, that means, of course, you cannot generate your own body heat. So, why wasnt someone cuddled up next to him? And, for hypothermia, his speech seemed OK.
The grass, thats the first thing I thought of too. Put alot of it under him, then start stuff the clothes. I just started watching the show, so, I'm not familiar with the character names yet.