Idk when exactly it switches to the new day, but when I open the stress score via tapping on the widget, it shows yesterday. Now it's 2:40. I just tried closing the Bevel watch app, then opening the stress graph through the widget - and it worked, it showed the new day. But after a few seconds it fell back to yesterday. I repeated the test, so it's definitely a bug. A few hours after midnight there is no current graphs on the watch, since they show the previous day.