[scep12]

Do you really need to wear a watch to bed for that? Why not something less obtrusive and comfortable, like a sweat band around your ankle? BTLE is cheap, i'd rather wear two devices with focused purposes than a clunky watch with an oversized battery.

[TeMPOraL]

Pebble is great for that. They went for e-paper-like screen and buttons instead of backlit screens and touch, and you can easily pull 5+ days of battery life while having it work as an actual watch (i.e. screen always on = time always visible).

Myself, I don't mind multiple devices but not each with a single feature. I would also like them displaying things through the watch, and not just the phone.