[rexpop]

Then, what's the concern?

[discreteevent]

That a little machine with a motion sensor and a few if statements is determining the quality of their sleep. (In fairness they also complain of being tired)

[rexpop]

It's their complaint that concerns me.

[newsbinator]

The concern is feeling tired all the time, mainly.

My fitness band's "Deep Sleep" count seems to correspond to how tired I feel, even before looking at it.