Hi David! I do NOT know how did all those wild shifts and especially the 22 hours with only 9 hours off to recharge!! I would be a zombie and a very dangerous nurse not to mention at the age of 60!! Wow! My hat is off to you!! I would have literally and accidentally hurt/killed someone's loved one. I believe my health issues are a lot to blame for my lack of energy these days. I have really bad iron deficiency anemia, low vitamin D level along with all my female hormones being low, in particular a super low testosterone level. I will say that I'm currently seeing my NP for most of these issues and soon will see my OB doctor and I'm hoping soon to resolve all which is zapping my energy levels. Once all that's fixed, then I plant to get my tired self back to exercising too. Hopefully then I will feel like these 12 hour shifts won't wipe me completely out like they do now. I definitely posted my previous posting after working two busy 12 hour shifts and I was definitely tired. I only have 1 day off, today, then back for 4 in a row. I picked up a little overtime and I'm already regretting it!! LOL