I just got my watch yesterday and glanced over it midday. The watch kicked into sleep mode and I wondered why this happened. It looks like the default schedules are for 12pm (aka lunchtime) to 7:00am. I think the defaults are accidentally set to the wrong AM/PM.
I changed mine to 12:00am (shows as 0:00am in the ui) and hopefully that makes more sense.
firmware version 7.24