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From the Spongebob Wiki:
"SpongeBob and Patrick are racing to Sandy's Treedome to play. However, the dome has a metal cover on it, and a "KEEP OUT" sign. They go inside the entrance, where they find a television. The television turns on and plays a video, which shows Sandy in a nightgown, eating acorns to store up for the winter. Sandy (on the TV) explains that she is hibernating for the Winter, and that they shouldn't disturb her. However, Patrick insists that they should go in. They open the door, and see that the inside of her treedome is filled with snow, which they are unfamiliar with. They go into the tree and find a monstrous, obese Sandy, sleeping.
However, when they make too much noise in her room, she suddenly gets up, sleepwalking, and attempts to kill them, believing them to be "Dirty Dan" and "Pinhead Larry", outlaw villains from her dream. However, she soon falls back into her bed, asleep, with Patrick making sure she won't get up again by giving her a pair of earmuffs. SpongeBob and Patrick leave the tree to play in the snow. They pretend to be Dirty Dan and Pinhead Larry, mocking Sandy, and begin fighting over which one of them is Dirty Dan. However, the vibrations from them wacking each other with a huge snow shovel(SpongeBob) and a massive baseball bat with a nail through it(Patrick) knock off the earmuffs, allowing Sandy to hear the ruckus, which alerts Sandy, who she comes out of her tree and begins to attack SpongeBob and Patrick. She immediately throws Patrick aside when he is not looking, and then chases SpongeBob until he falls into a pit. SpongeBob tries to throw a small piece of wood at her, but Patrick comes and gets in the way, accidentally taking the hit. He falls into the ditch and then Sandy pounces on them, beats them up, buries them alive, and goes back to bed. As the winter storm grows more intense, SpongeBob and Patrick try to escape, but find that the door's frozen shut. Unable to survive in the cold weather, they go into Sandy's tree and rip off all her fur,SpongeBob makes his share into an "eyebrow/goatee combo" and Patrick fills his pants with the fur he ripped off.. SpongeBob proclaims that he is prepared for the "longest, coldest Winter ever!!" However, Winter quickly comes to an end and Sandy wakes up, normal sized. She is surprised to see SpongeBob and Patrick, but soon realizes that they are wearing her fur and that she is nude. The last scene shows Sandy drinking lemonade with SpongeBob and Patrick, whose bodies are wrapped around her to form a makeshift "coat"."

Seems like an interesting episode. Let's review it!

Plot: 7.5/10

One of the more developed plots of the TV show that doesn't totally revolve around childish humor. There are various adult references and it just takes a keen ear to spot them.

Enjoyment: 8/10
Personally I find the jokes and whatnot on this episode to be quite entertaining. With various morphs of the characters and funny arguments it's a extremely hilarious episode.

Overall: 7.5/10
Read above.