Sorry that it's not the most high-tech of solutions. I could probably make an app for monitoring both of those if it helps :-S
If you're like me, you'll want it to be controlled wirelessly from across the room so that you have to get out of bed to actually turn it off.
Wraps around the wrist, and has an alarm that vibrates so that (theoretically) only you wake up.
I'd definitely not wake up only with light though, I am far too much of a deep sleeper :s
http://www.amazon.co.uk/Natural-Sunrise-Alarm-Clock-Simulato...
Coupled with nature sounds, it might be perfect :).
EDIT: another link with more details http://mmminimal.com/minimal-ring-alarm-clock-designed-for-c...
Wife used to have a WakeMate. Worked similarly, but they have since shut down the service.
Problem solved.
To get up and avoid disturbing her I bought a "vibrating alarm clock for the deaf". Put it under the pillow, and it woke me up and left her sleeping. Definitely a good purchase.