I recently bought an Eight Sleep Pod 3 Cover to help improve my sleep. While I don't use a sleep tracker, I can say that my subjective view is that I am now getting significantly better sleep than I was without it. I was finding I would wake up early, e.g. 4am, and then not be able to get to sleep. Now, if that happens, I find I do fall back to sleep quickly and get about 8 hours of actual sleep.