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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
We've taken a similar approach, I won't divulge exactly what we've done yet, but our goal was to not have a button that would have to be placed somewhere that it wasn't going to get pressed in the middle of the night, would have to be large enough to be usable, adding thickness to the headband at some point.