The next step was to recreate my sensor circuit and get back to where I was with the Arduino, and now I have it all soldered together in a more permanent fashion.
For now anyway, that pretty much wraps up the hardware side of things. I'll create an enclosure later, and maybe add a few more sensors (temperature, humidity, etc).
The other side of the coin, my Android app, has been coming along in between hardware work. I have it communicating with the sensor, and have a nice setup process to calibrate the sensor for any bed (measuring the dead load of the mattress). And I'm about 60% of the way toward using Google Calendar to set Alarms. Though Android's Calendar provider is rather... rudimentary. So I'm having to write a bit of a wrapper library in order to utilize it.
Anyway, that's it for now, I should have a working prototype very shortly!