Three things keep me awake:
2) Being cold
3) Having to go to the bathroom
I've learned that asthma doesn't go away if you ignore it. I keep trying to will it away, but the best thing to do it to sit up and take some Albuterol.
Sometimes snuggling with a Nalgene filled with hot water will jump-start my sputtering radiator. A hot rice bag is nice too. So is a heating pad.
Putting off going to the bathroom gives me miserable dreams.
Ignoring problems causes discomfort.
I love hot water.