It looks to me like changes were made to Connect yesterday which may have caused some issues.
Yesterday, my step widget showed 0 steps for about an hour or so although drilling down showed the same steps as my vivosmart. This was fixed later in the day but this morning, my stats from sleep detection are totally off-the-wall. Sleep levels make no sense. The movement graph ends at midnight which is probably why the levels make no sense this morning. Also, Connect said I woke up when I did my first sync of the day although I had been up and moving around for more than an hour by then. My steps for today so far make sense so I don't think it's the accelerometer of my vivosmart that is causing this.
The status page shows everything Green but there is a disclaimer at the top of the page indicating Connect is experiencing issues.