Hey thanks for the reply. I'm very new to the sport, 16 jumps. In truth I wasn't sure if it was the MS or the adrenaline wearing me out. Figured it could be one or the other, or both. I never heard of the Coppertone suggestion, but it's interesting for sure. Definitely couldn't hurt. I take high dose of Vit D now (20,000IU). I thought I seen someone on the forums with MS, but can't find it now. I'm thinking I found it somewhere else. No biggie though