Full Body:
I work based on the concept that the body has fluids that constantly mix (blood, lymph), and so, like a colored dye poured into a corner of a pond, it eventually spreads out across the entire pond. I think that the effects of PEMF are similar. My strategy, therefore, is to treat whatever specific areas seem to be swollen or painful at the moment (hands, feet or legs, back, whatever) with the C5 pads, and do so for several hours before bed. This seems to have a very good over-all (whole-body) effect for me.
Sleep:
I myself do not have sleep problems, so I can’t say much from personal experience about that, sorry. The people that I know who use it for sleep have a lot of variability in what works for them, probably because of human variability plus the fact that everyone has a different issue that disrupts their sleep (for example, chronic pain, anxiety, etc.). People have strong opinions on this, but I do not see any over-riding patterns of use. Mostly it just seems that people need to experiment to find what works best for them as an individual.