Yes and yes.I have had Sleep Apnea for years and use a C-pap machine at night to keep my throat open. I was very fatigued before the Sleep Apnea was diagnosed and began using the C-pap machine. When using the machine, I get enough sleep up to 10 hrs per night to feel good. Of course 10 hrs is hard to do. If I get tired during the day and feel sleepy, I take a nap using the machine. With the machine, I still get tired and have pain in legs,feet,knees but with the machine & 10 hr sleep I find these problems are much reduced.