Ernie:
Nothing clever to offer here, I'm afraid. I've found that even though I usually sleep on my 'good' ear (the one that can hear) I can still hear the clock-radio alarm go off. Because we use a radio instead of a buzzer - and keep it relatively loud, but not 'blasting' (we live in a condo) - even if I don't hear it immediately, when I (inevitably) turn over, I do...and wake up. We each have a clock radio on the nightstand on our respective side of the bed. On those rare occasions when my wife and I have to be up at different times, she sets the alarm on her side of our (king-sized) bed and because she's light sleeper (I'm the opposite) she wakes up quickly and shuts it off. No problem.
I've read that even when your (working) ear is covered, you can still hear close to 65% of whatever sound is present (at anything near a normal level). If this is so, lying on your 'good' ear in bed won't entirely block out all sound. So, I think the fear of being SSD and not hearing anything just because you lie on your hearing ear may be a tad overstated, although not to the point that the concern isn't valid.
Jim