[avalaunch]

...I have exactly 8 minutes and 20 seconds to get that watch off of your wrist and into my pocket.

I know this isn't a real concern but it was the first thing I thought when I saw the timer.

[dllthomas]

For sure it can be a downside as well. Of course, napping in situations where it might be a downside probably wouldn't be wise in the first place (... and maybe they could build in a proximity sensor?)