I think it was the 80s. All I remember were these floating, green/black orbs that at one point came to hover over some kids in bed. Then the kids feet started shriveling and rolling up the legs. I don't remember if it showed what happened then, like the like were absorbed or souls sucked into the orb or something like that.
For some reason I've associated this for a long time with the Body Snatchers so maybe it was around the same time. Since then I've learned it wasn't that movie.