I would think that the risk of respitory failure and the need for a nasal mask would fit into the criteria of watching over during the night. The mask can become detached or move during sleep (even if the cl is on REM suppressants). What you will need is back up from the Specialist/Consultant because ordinary sleep apnoea has a built in gasp response which kick starts the breathing, central sleep apnoea doesn't. And, as you say, it is quite a rare condition so you will need to guide the dm to make the appropriate decision with as much info and back up as possible.
Marg
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