The idea is simple and perhaps not expected. Taken from my own experience when I didn’t feel well. I used a Heat Fan (low effect) to enhance the impact of lying in bed. Directing the flow of warm air towards the chest area. My concentration went up at the same time my body could completely relax. I think the relax part of the recovery is very important. But its a waste of time to listen to relax tapes if you are using your own energy to keep warm. I think forced convection is really the best you can get. Therefore I wonder if one could have this option in hospitals. Just open a window once in a while to let the extra heat out. Even if this energy cost it will still cut costs if it works as expected. I believe this idea is worth the research.