I'm watching a show about a "cursed highway". Apparently it was built over some graves and the spirits of those who rest there have taken umbrage at this. If you're dead, you no longer need your body. You're not "sleeping", you're dead. The traffic can't wake you up, and it's not like you need the land over you. Why would the deceased care about what's going on with their graves, especially after their bones have crumbled to dust?