Ladies, what would you do if you were dating a man who had this kind of sleep disorder?

WeaponZero
My sister is married to a man with a rather strange sleep disorder. He's prone to these fits of violence while he sleeps at night. They're not quite seizures, but he does flail his arms about with enough force to leave bruises on my sister. For whatever reason, though, he won't seek treatment for it and she still insists on sleeping in the same bed at him even though it means being woken up throughout the night by basically him beating the sh*t out of her in his sleep.

He's not a violent person and he would never do anything to hurt her when he's conscious.

Ladies, what would you do if you were dating a man who had a sleeping disorder like this?
Ladies, what would you do if you were dating a man who had this kind of sleep disorder?
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