Very bad product. Lots of software bugs, including losing information for a day for no reason. They contacted a company who said they hadn't heard from but would like to return the device so investigate. The kicker was that they wanted me to cover the cost and either ship the unit back to the seller or ship it direct. Everything on my nickel. The sleep cycle is not precise in the sense that it is the same every night. It seems to be a preparation. There are many other products like this one and I would suggest considering one of these.
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