I must explain the reasons behind my three-star rating. Firstly I can't really, or fairly, rate the product itself as it has had no effect on my chronic, life-long, insomnia (I am now 73 years old and accept that I am a very, very difficult nut to crack). Having said that I am currently dealing with, and having aggressive treatment for, another serious health issue which has possibly clouded the situation. What I can say is that I have been VERY impressed with the Zeez company. The Sleep Pebble arrived the next day after my ordering it, I was given a longer period to trial it than originally offered after explaining my situation to Anna Mackay and my money was refunded immediately after I returned it. I have had some lengthy telephone conversations with Anna who has been most patient with me and understanding of my situation (five stars for that). She has impressed me with her caring nature and given me a host of suggestions that might yet prove to assist me. Thank you, Anna I do appreciate the time and interest you have given me. Having tried numerous approaches to sleep improvement over many years I was looking at the Zeez Sleep Pebble as my last chance at gaining some benefit so I wouldn't say to anyone reading this to look upon this as an entirely negative review, nor to be put off trying it as I'm sure it has been utilised with great effect by many with sleep issues. I am hoping that if, or when, I finish my current medication I shall be able to try again with the Sleep Pebble as its modus operandi does make a lot of sense to me.