First, my feet are always cold in the Winter, except, last night after I put Vicks on them, they felt warm. I put a pair of wool socks on. When I was little, my Mom would put the Vicks in my chest and throat and wrap my neck with a wool type scarf, so I used wool.
OK. Next morning. I ALWAYS wake up between 7:30 and 8:00. Caleb, our dog, sits beside the bed waiting for me to get up, during that half hour window. This morning I woke up at 9:00, with a very clear head, no sinus congestion.
My wife wakes me up a couple of times a nigh, coughing. I had her try it last night. She didn't wake we up once.
Does it work? It certainly did last night, for my wife and I. So, try it, nothing to lose and you might be pleasantly surprised.