I have Echo plus, two dots and a show. For the last two nights the one dot in the bed room comes on, one night it came on at 3:45am and last night at 1am. The first night the blue ring came on stayed on and than went off. Last night it came on and than something started to play. I said Alexa off and it stopped. I do not have any bluetooth hooked up or cell phones. I checked the history for both days and there were no entries at those times.