I have MS and I can say the worst part of it is the heat and humidity. When I get really fatigued I listen to my body and if I have to take a day off from work just to sleep it benefits me. Also I stay away from sugars and carbs and starches it seems to slow me down. I've had MS for the last 8 yrs and take an injection every night. I have a full-time job that requires me to be outside in the Florida sun but I always have cold water and the work vehicle is always on a/c!