This was posted on the co-cure mailing list recently: I was intrigued by this abstract because frequent awakening (up to 10-12 times a night) is my biggest sleep problem. So I searched for reduced HRV and found this other study from 2007: http://www.cfids-cab.org/rc/Boneva.pdf Anyone out there want to explain a bit more about what causes reduced HRV and/or suggested treatments? In the little bit of searching that I've done I've seen it linked to everything from depression to congestive heart failure. So it's a bit difficult for me to understand how to view these studies. I'm hoping someone with more medical knowledge will be able to shed some light on this study as well as any other sleep problems related to autonomic dysfunction/dysregulation. Thanks!