The light sensor is probably the best idea. I'm not sure what it would take, somewhere like Home Depot or Rona might have easy install ones that you don't have to hard wire.
Having the light go off would probably scare the drunkards from doing it again.
Let's face it, the fact you're not being vandalized shows that they're just trying to take a short cut home. No harm, no foul . . . at least they don't think so. They probably don't realize that they're unintentionally waking you up (by the sounds of your outline they aren't being too loud, just drunk which can be noisy). If you stay up and ask them not too, tell them that landing on the rocks is actually waking you up, you know they don't mean to, but it's an unfortunate by-product of their shortcut. I'm sure they'd stop, and be apologetic.
It seems like there are two kinds of drunks in this world, the "happy-go-lucky drunk", and the "let's get ready to rumble drunk". It sounds to me like you're dealing with "happy-go-lucky drunks" which should make for a quick "can you stop?" and them saying "sorry".
Perhaps even leaving a note on the fence could do the trick.
But because I also feel the need for a more logical, and straight forward answer. The trip wire is only half the battle. You need to rig that to a trigger switch where they'll get shot with paintballs, cheese, or rotten eggs. Not only will they not trespass again, they'll respect your ingenuity!
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