Sebastian, I'm so sorry to read of your diagnosis. I hope you're having a slow progression. Like Beth mentioned, maybe there is a connection, but I've not read of this being a problem with MND.
I wonder though, as botox can be used to help with excessive perspiration under the arms (or soles of feet) and botox does temporarily paralyze the muscles, if you could have an unusual manifestation that is part of your ALS.... Maybe botox could still be an option for you to try. Definitely let your doctor know about it.
Lori, re: the body heat, My exhusband always put off the body heat when he slept in particular. He did not run a fever, and is a healthy man still. One of my kids does that too.
...so when I read your response, I just had to "share". Don and I recently went camping, I think it might have been right before you joined the forum. So there we are in a tent, and I am freezing, I mean I'm an absolute iceberg. (and of course he's contentedly sleeping) BTW we are sharing a two person sleeping bag. So, he finally wakes up because I've practically burrowed under him at this point, and is trying to warm me up, and I say to him "what the heck, you've got all of these muscles, you're not an ounce overweight, aren't muscles supposed to burn more than fat, why aren't to putting out any heat. seriously, where's the heat!" So.... being a man, he decided that this was as good of time as any to get up, and OPEN the tent flap so he can go take a pee..... I said NOOOOOO , and he said...well, never mind everything he said, but he did faithfully rub my feet until they weren't numb when he came back in.