The Movie is a Comedy, It is about a group of people that had to tot a dead body around for several days, They dress it to make it look like it is alive but to look like it is sleeping. It is not Little Miss Sunshine

Possibly Weekend at Bernie's (http://www.imdb.com/title/tt0098627/), Weekend at Bernie's II (http://www.imdb.com/title/tt0108539/) or Enid Is Sleeping (http://www.imdb.com/title/tt0099506/)