I have an old one I wear to bed to charge my nice one at night. Then I wear my nice one (series 5 lol) during the day. The sleep stats is kind of interesting but I also like the alarm vibrates my watch so I’m not blasting the house with a loud morning alarm (which I have as a backup). It auto switches between the two im wearing but sometimes it REALLY wants to stay on sleep mode when I swap them so I have to manually shut that off a few times or miss notifications in the morning