A weird Electrical problem

I don't know if this every happened to any one before: I have a 300 TE with 130M on it, Last month I had a valve job done and the head gasket replaced at the same time. Last Saturday night when we got ready to leave (we live in Michigan and it is cold) I went out and started the car up and turn on the heat. After about 5 or so minutes I went to leave. I turned on the head lights, and the wiper I notice the wiper ha a hard time moving, well I shut it off the wiper and went to back the car up the car just died. I went to restart it and there was nothing no power not a thing. I said a few cuss words and went to get out and the dome light came on. Well as the car sat longer there was more power. After a half an hour the car started up again but the light were dim when I raced the engine my head lights got bright and everything seamed to be working fine. This is the second time that this has happed to me. The battery is only 1 year old I have replace the OVR is this s sigh of a failing alternator, a bad OVR or the ghost in the machine.