I seriously need to get some sleep.

I've been up for the past three nights with Éiden who has been waking up coughing. So far, I've put a vaporizer next to his bed and have poured camphor oil into it to help him breathe better. I've also tried giving him honey (which has worked wonders in the past) and dark chocolate (which has also helped somewhat but not as much as the honey). Unfortunately, while these have all helped to some extent, Éiden is still spending a good portion of the night coughing.

Does anyone have any other cough remedies they've found success with? I'm trying to keep away from cough syrups since they don't work any better than what I've already tried and the kids seem to wake up groggy and unrested in the morning after I've given it to them.