Animate the snoring entity as a sprite with at least two frames: snore start and snore end. Then attach scripts to this two sprite frames to play the sound. So whenever the anim loop reaches snore start, the first snore-sound will be played, and when it reaches snore end, the other will be played. Then set the frame times so that both sounds can play full length.
So each entity is snoring independent, you can even make them snore with different timing by animating one entity a little bit slower, which will make the scene less static.
