I bought the Zeez pebble for my husband who never seemed to feel refreshed after a nights sleep. We felt it was a bit of an investment spend. From the first night of use my husband felt the difference. He woke feeling refreshed and ready for the day ahead. He felt he was getting better qualty deep sleep. And this had continued five/ six weeks later. We are overjoyed with the Zeez pebble. Its not bulky for under the pillow, there is no noise with it and just charges up like you would charge a mobile phone. If you are considering getting a Zeez pebble we,d say give it a go, it could change your quality of sleep.