So let's look at a couple nights in a little closer detail.
Here's Wednesday night. I was wearing the watch.
My wife's alarm clock goes off at 5:53. She turns it off quickly and gets quietly out of bed. I'm usually not even aware of it, but you can see it caused me to roll over or something.
My alarm clock goes off at 6:07. And I hit snooze a couple of times before I get out of bed because I'm groggy as hell. Look how many times I woke up in the night! It's like that every night. I'm able to get right back to sleep again, but not that deep, because I'm tossing and turning just half an hour later each time.
Now look at my wife's sleep last night. It looks like she was tossing and turning at the end. But that was just her getting up and putting the watch on the dresser, where it thought the wearer was asleep again.
I have sleep envy. Look at all that beautiful vast ocean of blue.