I really look forward to the day when we can rely more on implicit data from users for this kind of automation. I think it will start with purpose built devices (eg Wakemate), but then evolve into more sophisticated platform type devices ready for anyone's code.
I've been thinking about this some time now and I think that the company that eventually figures this out (human self-monitoring devices) - on a full commercial scale - would be very successful and quite powerful (that medical data is valuable).
