Currently I'm working on a wider idea with extending swi-prolog with temporal logic and adding event listeners to it. Theoretically it can give you ability to describe things like:
If it is late then add listeners to lite sensor and microphone
If it is late, dark and silent then owner is sleeping
If owner was sleeping before and alarm rang the owner is not sleeping
If owner is sleeping then switch to silent profile (start answering machine, that will inform caller, that owner is sleeping and ask if it is really needed to wake him).

Or
If a lecture is been told now and I'm at university then switch to silent mode.

But I'm at early stage: I know how to compile C++ programm with prolog integration that would work on n900 and general workflow design is done.