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>>headal+(OP)
We're building a neuromodulation sleep headband, and we've always had the aim of getting to the point where the user puts it on, it does it's thing (slow-wave enhancement) the person takes it off in the morning and goes about their day.

I don't even want to put IO into the device at all. Not only because it increases cost and size, but because I don't what the user having to interact. We have to find better ways to fit the device in your life, so you don't even think about it.

>>pedalp+Q61
I was working on a similar IO problem with wearables a while ago (though by the sounds of things, far less seriously than you are), and I had the idea that maybe that band/strap could function as an on-off switch, so when you undo the band (which you do when taking it off), it turns the device off, and vice versa. Could be something you could try too

>>bodge5+ad1
I'm putting capactive sensors in my wearables to turn them on when in contact with a human.

I strongly believe that the class of widget I'm building should stay firmly out of the user's way. The point is to forget it's there. So, as simple IO as possible.