Is there some kind of mechanism at present by which when one falls asleep the music system switches off?
Answer:
Yes, but they're all fairly sophisticated. The easiest would probably be a motion detector. Some office areas are equipped with these on the lights; if nobody is moving, the lights switch off. This would require you to occasionally lift your hand or something to keep the music playing, so it might also shut off while you're still awake, but you could turn it back on very easily. Once you fell asleep, it would eventually turn itself off.
More complicated would be a biosensor. You would have to connect some sensors to yourself to measure your heart rate or respiration, kind of like a polygraph. If programmed properly, it could recognize the metabolic changes that accompany sleep, and turn off the radio.
You can hook up a motion sensor to swithch off the electrical supply. A time fram can be put in place for the electrical supply to be switched off if there is no movement over a significant period of time.
The sleep timer feature can be used too.
most tvs and radios have preset time frames for which they can be set. It's the sleep feature. What's wrong with that? Oh yeah it's gotta go off the exact second you fall asleep. Sorry no go. Only sleep feature with preset time frames.
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