I have had ME and fibromyalgia for about ten years and have had some success in certain lifestyle changes to manage the conditions. I have been working hard though over the last few weeks again to try to turn around the relapse I have been experiencing since September last year. One thing I would really like to crack is raising my HRV. I have been using Elite HRV and a chest strap to monitor my HRV for about three years. My baseline used to be low - in mid 40s but over the last year has dropped to low 30s. I am convinced that this is a good marker of my condition and if I was able to raise my HRV it would go hand in hand with improvement in my health. I also believe that this is linked to my sleep quality also and increasing the amount of deep sleep I get is also connected. I live a fairly relaxed lifestyle and would not say I am a "stressy" person. As part of the management of my condition I try to avoid stress. I drink water with electrolytes in, I walk daily, enjoy nature, read a lot and try to be thankful every day. I also practice yoga whenever I can although energy and pain levels do often stop me from being able to. Any advice about how I can raise my HRV and become less sympathetic nervous system dominated - I am concerned about how low my HRV is and how it has dropped over the last year. Can you recommend any treatments, books, or other resources that would be helpful? Thanks.