I have purchased 2 Zeez Pebbles, the first in 2018, for my partner. She had experienced years of insomnia and had tried many remedies, but with no significant success. I therefore purchased the Zeez with some degree of trepidation. Thankfully, within a few days, it began to have a positive effect, which increased over the next few weeks and has remained ever since. I did wonder if this could have been psychosomatic, but whenever she has omitted to recharge the Zeez, she has noticed immediately. As a result, when my daughter in law experienced similar problems, earlier this year, I purchased her a Zeez for her birthday, with similar success. The Zeez definitely delivers on its promises. Peter