Guys, I think you missed the point.
If I understand Chazz correctly, his long lost radio would drop the audio level by a half or third when put into sleep mode ( lullaby music ) for 30 to 60 minutes then go silent.
Then, just when you get to the good part of your dream, BAM!! , it scares the bejesus out of you at full volume! (slight exaggeration)
I do not use an alarm clock anymore. I seem to wake up at the same time every day (Damn!). Are there any manufacturers that implement this feature?
If I misunderstood the premise, please ignore.