My very first use was mistake cause connect app have to put general sleep time. So, I was though every night, watch sensor inly detect about the sleep only within sleep time manual setting. As I fix for next day, I wrong edit for last day night sleep time. User help required for very first step use. Even though user is not developer, how sensor works need to know by user. Now, I regulary use Copilot AI to review my sleep cycle and conclusion regulary as I didn't see germin have also giving remark for my sleep. I was a stupid user before unfamilier with this device. The reason is "not easy to apparoch the device familiar in the very first step" and no where to learn qiuckly about. Now, almost 6 months make me familiar.