Having used the Zeez for a couple of weeks my sleep is definitely improving. I find that I fall asleep quicker and although I do wake at night - I can get back to sleep relatively easily. Ok - so it's not a total fix. I do have blips - usually when I have issues on my mind! But generally, I am very happy with my little pebble. Sorting the room out so there is no Wi-Fi interference was relatively easy and it's very nice to sleep without the light from my radio and phone. Anna was most helpful with answering my questions and sorting out a replacement Zeez as I had incorrectly estimated my resting heartbeat. I needed the slower model. She also advised that wearing my fit bit in bed was fine and that has been very useful in actually seeing the improvement in my sleep. Overall I am very happy and although the Zeez is not cheap I feel a good night's sleep is worth investing in.