Perhaps you just figured out how to deal with your insomnia, Erin . . . just wear yourself out by putting clean sheets on every night?
Seriously though, if I was not currently in an attack, I'd be questioning why I was having these kind of problems, especially with stamina. I have days where things are 10 times more difficult (fingers don't work, dropping things, can't think clearly, etc.), but pretty much the only time I really struggle physically is when I am in an attack.
It is very important to have a daily exercise routine, to maintain strength and energy with this disease. Your weight isn't nearly as relevant as staying in shape . . . which I have especially noticed to be true with "The Biggest Loser" contestants ...
Some of those people start out at 400 lbs, but by the time they reach 250 lbs, they can JOG up mountains.

They are competing against people who start out at 250 lbs, but don't actually do much better (then the now 250 lb'ers), even though they are down 170 lbs. It is about staying in shape, no matter what your weight.
Everything is harder with this disease (clumsiness, thinking obstacles, etc.), so that requires that we keep fit physically. I don't try to tackle my biggest physical challenges at night time . . . but push myself in this way during the mornings when I have the most energy.
Even if you start out slow, with just a stretching routine, I think it would serve you well to plan to stay as physically fit as possible (even if your brain isn't as "fit" as it once was). You are too young to be having this kind of struggle already.
Cherie
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I am not a Neurologist, Physician, Nurse, or Hairdresser ... but I have learned that it is not such a great idea to give oneself a haircut after three margaritas
.