After many years hunting, after battles won, fights lost, blood shed, demons slain, friends gained, friends lost, Sam and Dean finally die. They’ve both had their fair share of this of course, but this isn’t a quick pit-stop into hell. Finally, the Winchester brothers are gone. They will be missed of course, but death catches up with everyone. This isn’t hell, or purgatory, or any twisted form of torture. Sammy and Dean are in the heaven they deserve. On the “road” reliving their lives, in reverse order. they relive their happiest moments, and finally,
"Goodnight Sammy," Dean says, and his mother tucks him into bed, and this plays in the background as he falls asleep.