Hello again. I was wondering if the above is a correct way to say sleep well? I saw another topic on here from a couple of years ago that says cysga’n dawel is correct, but elsewhere on the internet it says the above is not wrong. The reason is, I want to use it in a song, because it rhymes with nos da… nos da, cusga’n dda… would it be acceptable as a way to say sleep well? 
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Cysga’n dda is fine for sleep well, as is cysga’n dawel which is more sleep quietly/ peacefully. I’ve heard both.
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an excellent and helpful answer, thank you
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