Full disclosure, I already sleep good (huge fan of Eternus). Took me several years to dial it all in. However, what I wanted out of this product was an increase to HRV. I never saw an increase to HRV. With that said, HRV IMO is far more complex than a supplement. While HRV is obviously a good bio-metric training tool, it is also a measurement of your overall state of mind. Eternus was part of my equation when learning to dial it all in. While this product did not do what I wanted it to, it do...Read more.