You’re not going to get that sort of fidelity from a smart watch, you need some brain traces

I suppose that dropping of the pencil is caused by muscles relaxing. I'm surprised a smartwatch can't detect this relaxation. But perhaps it's at the wrong location for that.

Maybe? Why would you want to when a simple solution exists?

Is this a legit question? Instead of trying to sleep in an awkward position where you can drop something and have it wake you up, you could sleep in your bed and be woken up at the right time.

OTOH, this just feels like pushing some app solution on something that doesn't need it. Different strokes.

And "right time" is highly debateable given the current tech at determining sleep cycles.

Maybe from velocity? Just hold your hand up, and when it drops...