Apparently my MIL told this pearl of wisdom to ds (3), apart from the fact that he pronounced it "cheeses". It made him scared to go to bed for a week (and we didn't know why - but now it all fits) and then would only go to bed with a million teddy bears in - presumably so Jesus couldn't fit in as well.
I promised myself I would never use the "went to sleep for a long time" line and now my silly MIL has completely failed to explain death.